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# The energy stored in an inductor of self inductance

The energy stored in an inductor of self inductance L carrying current l, is given b Two ends of an inductor of inductance L are connected to two parallel conducting wires. A rod of length l and mass m is given velocity v 0 as shown. The whole system is placed in perpendicular magnetic field B. Find the maximum current in the inductor Energy The current flowing through the inductor generates the magnetic field where the energy is actually stored. In a pure inductor, the energy is stored without loss and is returned to the rest of the circuit when the current through the inductor is ramped down and its associated magnetic field collapses The energy stored in the magnetic field of an inductor can be written as: w = 1 2Li2 (2) w = 1 2 L i 2 (2) Where w is the stored energy in joules, L is the inductance in Henrys, and i is the current in amperes. Example

Energy in an Inductor When a electric currentis flowing in an inductor, there is energy stored in the magnetic field. Considering a pure inductor L, the instantaneous powerwhich must be supplied to initiate the current in the inductor is so the energy input to build to a final current i is given by the integra The energy stored in the magnetic field of an inductor can be calculated as. W = 1/2 L I 2 (1) where . W = energy stored (joules, J) L = inductance (henrys, H) I = current (amps, A) Example - Energy Stored in an Inductor. The energy stored in an inductor with inductance 10 H with current 5 A can be calculated as. W = 1/2 (10 H) (5 A)

Self-Inductance RL Circuits Energy in a Magnetic Field current reaches a maximum and all the energy is stored in the inductor. At the same time, the current increases the stored energy in the magnetic field of the inductor. When the capacitor becomes fully charged (with the opposite. Energy is stored in a magnetic field. It takes time to build up energy, and it also takes time to deplete energy; hence, there is an opposition to rapid change. In an inductor, the magnetic field is directly proportional to current and to the inductance of the device. It can be shown that the energy stored in an inductor Eind is given b The inductor energy calculator calculates the energy stored in an inductor, based on the size of the inductance of the inductor and the current going through it, according to the above formula. A user enters the inductance, L, and the current, I, and the result will automatically be calculated and shown - Establishing a current in an inductor requires an input of ener gy. An inductor carrying a current has energy stored in it

### The energy stored in an inductor of self inductance L

1. Obtain the expression for the magnetic energy stored in an ideal inductor of self inductance L when a current I passes through it. Hence obtain the expressio..
2. us - to opposing ones
3. The current flowing through an inductor of self inductance L is continuously increasing. plot a graph showing the variation of (i) Magnetic flux versus the current (ii) Induced emf versus dI/dt (iii) Magnetic potential energy stored versus the current
4. Derive the expression for magnetic energy stored in the inductor of inductance L carrying current I. Medium. Answer Self-inductance of a coil is defined as the ratio of the total flux linked with the coil to the current flowing through it
5. Zigya App (a) Show that the energy stored in an inductor i.e., the energy required to build current in the circuit from zero to I is where L is the self-inductance of the circuit. (b) Extend this result to a pair of coils of self-inductances L1 and L2 and mutual inductance M. Hence obtain the inequality M2 < L1 L2

Similarly, the first term on the right-hand side of equation (i) is the total thermal energy developed in the resistor at time t. Thus 1/2Li^2is the energy stored in the inductor as the current in it increases from 0 to i. As the energy is zero when the current is zero, the energy in an inductor carrying a current i, is `U=1/2Li^2 Derives the energy stored in an inductor, with an example of an ideal solenoid, and introduces energy density of the magnetic field. 8.02 Physics II: Electricity and Magnetism, Spring 2007 Calculating magnetic field energy and self-inductance of a current-carrying wire Inductor MCQ | Inductance MCQ 31. If the self-inductance of a solenoid is 2 Henry and the current flowing through it is 2A, the energy in the electromagnetic field will be 8

Therefore, magnetic potential energy in s inductor (solenoid) is given by The self inductance if a solenoid is L= μ 0 n 2 Al Al is the volume of the solenoid. Therefore, the energy density (energy per unit volume) is give Self-inductance of a coil is numerically equal to the flux linked with the coil when the current through the coil is 1 A. Energy stoted in an inductor: Consider a source of emf connected to an inductor L. As the current starts growing the opposing induced emf is given b Definition: Self-inductance or in other words inductance of the coil is defined as the property of the coil due to which it opposes the change of current flowing through it. Inductance is attained by a coil due to the self-induced emf produced in the coil itself by changing the current flowing through it

### Obtain the expression for the magnetic energy stored in an

1. Obtain the expression for the magnetic energy stored in an ideal inductor of self inductance L when a current I passes through it. <br> Hence obtain the expression for the energy density of magentic field produced in the inductor
2. Obtain the expression for the energy stored in an inductor L connected across a source of emf. Medium. Answer. Self-inductance of a coil is the property of the coil in which it opposes the change of current flowing through it. Self induction of long solenoid of inductance L,.
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### Inductance, Power and Energy of an Inducto

1. The energy of a capacitor is stored in the electric field between its plates. Similarly, an inductor has the capability to store energy, but in its magnetic field. This energy can be found by integrating the magnetic energy density, over the appropriate volume
2. Inductors Store Energy The magnetic field that surrounds an inductor stores energy as current flows through the field. If we slowly decrease the amount of current, the magnetic field begins to collapse and releases the energy and the inductor becomes a current source
3. The energy stored in the area under the power curve. And this could be maximum if the power of the inductor goes to zero. Or the current or voltage of the inductor goes to zero. As the exponential decay or rise it theoretically t -> infinity. but practically when it consumes the time of 5$\tau$. If you want to increase the energy store in an.
4. This work done is stored as magnetic potential energy and is given by: The self-inductance of an inductor is obtained by making use of the relation. L = N2⁄S. where N is the number of turns. S is the reluctance of the coil (A/Wb). Question 3: Self-inductance depends on ____

### Energy Stored in an Inductor Electrical Academi

• Self-inductance, the effect of Faraday's law of induction of a device on itself, also exists. When, for example, current through a coil is increased, the magnetic field and flux also increase, inducing a counter emf, as required by Lenz's law. Energy Stored in an Inductor. Share Tweet Email Google+ WhatsApp This is a lesson from the.
• As the connections are made, the current grows in the circuit and the magnetic field increases in the inductor. Part of the work done by the battery during the process is stored in the inductor as magnetic field energy and the rest appears as thermal energy in the resistor
• The SI unit of self inductance or inductance is Henry (H), 1H = 1V ⋅ s / A. The self inductance is also called simply inductance but do not confuse this with mutual inductance. Remember strictly that if you are simply saying inductance it is self-inductance, not mutual inductance explained in the next article
• It is worth noting that both capacitors and inductors store energy, in their electric and magnetic fields, respectively. A circuit containing both an inductor (L) and a capacitor (C) can oscillate without a source of emf by shifting the energy stored in the circuit between the electric and magnetic fields
• Definition of Self-inductance Joseph Henry 1797 -1878 Self-inductance depends only on coil geometry It measures energy stored in the B field Recall capacitance: depends only on geometry It measures energy stored in the E field V Q C{SI unit of inductance: unit current {linkedL flux i N L { ) B self-inductance number of turns flux through one.
• e the self -inductance of a toroidal solenoid with cross-sectional area A and mean radius r, closely wound with N turns of wire on a nonmagnetic core. Assume that B is uniform across a cross-section (that is, neglect the variation of B with distance from the toroid axis)
• It is worth noting that both capacitors and inductors store energy, in their electric and magnetic fields, respectively. A circuit containing both an inductor () and a capacitor () can oscillate without a source of emf by shifting the energy stored in the circuit between the electric and magnetic fields
• The value of inductance in an inductor is a function of the size and number of turns in the coil, The term 'self-inductance' is used when a conductor has a voltage induced in it by: The energy that can be stored in the electromagnetic field around an inductor can be calculated from the following formula:.
• The current flowing in the inductance has to do work against the induced emf in the inductance. This work is stored as magnetic potential energy in the inductor. The work done is given by (3) Hence the magnetic potential energy proportional to square of curren
• Energy of the Magnetic Field Derives the energy stored in an inductor, with an example of an ideal solenoid, and introduces energy density of the magnetic field. 8.02 Physics II: Electricity and Magnetism, Spring 200

### Energy Stored in Inductors - Engineering ToolBo

The Energy stored in the Magnetic Field of an Inductor For the circuit shown, after the switch is moved from 1 to 2: The instantaneous power received by the resistor, (R·i2) is dissipated as heat Inductance of a Toroid (10:20) Calculation of the self inductance of a toroid ; Stored Energy; Stored Energy in an Inductor (11:14) Derivation of the stored energy of an inductor from the work done by an EMF source ; Magnetic Field Energy Density (13:21) Concept of magnetic energy density, with example of a large solenoid magnet ; LR Circuits. inductor: A device or circuit component that exhibits significant self-inductance; a device which stores energy in a magnetic field. When a conductor carries a current, a magnetic field surrounding the conductor is produced. The resulting magnetic flux is proportional to the current A circuit with resistance and self-inductance is known as an RL circuit.Figure $$\PageIndex{1a}$$ shows an RL circuit consisting of a resistor, an inductor, a constant source of emf, and switches $$S_1$$ and $$S_2$$. When $$S_1$$ is closed, the circuit is equivalent to a single-loop circuit consisting of a resistor and an inductor connected across a source of emf (Figure $$\PageIndex{1b}$$)

If an inductor is designed so that any one of these factors may be varied at will, its inductance will correspondingly vary. Variable inductors are usually made by providing a way to vary the number of wire turns in use at any given time, or by varying the core material (a sliding core that can be moved in and out of the coil) This allows to define a new two-terminal element called inductor (also called coil), characterized by an inductance L. The coil has multiple windings or turns (fig. 3.12a) and is used to store energy in the form of magnetic field. The electric symbol for inductor is shown in fig. 3.12b. a) b)

### Inductance Physics I

Give the expression for energy required for the maximum Current in an inductor, or Write the expression for maximum energy stored in an inductor. (March 2014) Answer: Energy required U = $$\frac { 1 }{ 2 }$$ LI 2. where, L - Self inductance of the coil and I - maximum current. Question 4. Differentiate the terms self inductance and inductor. A coil of resistance 20 Ω and inductance 5H has been connected to a 200 V battery. The maximum energy stored in the coil is (1) 250 J (2) 125 J (3) 500 J (4) 100

Voltage across Inductor: Current of the Inductor: Where. V is the voltage across inductor; L is the inductance of the inductor in Henry; Di/dt is the instantaneous rate of current change through the inductor (b) energy stored in each inductor with the current flowing through it. Compare the energy stored in the coils, if the power dissipated in the coils is the same. (Comptt. All India 2017) Answer: Comparison of energy stored : Question 68. The current through two inductors of self-inductance 15 mH and 25 mH is increasing with time at the same rate

### Inductor Energy Calculator - Learning about Electronic

23.Define the term self-inductance of a solenoid. Obtain the expression for the magnetic energy stored in an inductor of self-inductance L to build up a current I through it.[All India 2014] Ans. 24.The current flowing in the two coils of self-inductance =16 mH and L2 = 12 mH are increasing at the same rate Energy is stored in a magnetic field. It takes time to build up energy, and it also takes time to deplete energy; hence, there is an opposition to rapid change. In an inductor, the magnetic field is directly proportional to current and to the inductance of the device The self-inductance of the coil is 5.0 henrys and the current in it is 3.0 amps. If we round our result to two significant figures, we find an answer of 23 joules. That's the energy stored in this inductor and, therefore, the energy stored in the magnetic field of the inductor Calculate the energy stored in an inductor. You can watch the video associated with this chapter at the following link: Historical Perspective: Joseph Henry (1797-1878) was an American scientist who discovered self-inductance, and he also discovered mutual inductance before Michael Faraday, although Faraday published his results first XI. Inductance - Worked Examples Example 1: Solenoid A long solenoid with length l and a radius R consists of N turns of wire, as shown in the figure below. (a) Neglecting the end effects, find the self-inductance. (b) A current I is passed through the coil. Find the energy stored in the system. Solution

Energy is stored in a magnetic field. It takes time to build up energy, and it also takes time to deplete energy; hence, there is an opposition to rapid change. In an inductor, the magnetic field is directly proportional to current and to the inductance of the device. It can be shown that the energy stored in an inductor This phenomenon is called self-inductance, and the coil is referred to as an inductor. The quantitative measure of this effect is the inductance L defined by An inductor can store energy. The power (= energy / time) being stored in an inductor is This implies (by a little calculus) that the energy stored in an inductor i 8: (a) Calculate the self-inductance of a 50.0 cm long, 10.0 cm diameter solenoid having 1000 loops. (b) How much energy is stored in this inductor when 20.0 A of current flows through it? (c) How fast can it be turned off if the induced emf cannot exceed 3.00 V That is, the permeance is proportional to the inductance. Now, the energy W stored in the magnetic field of an inductance L due to a current i is given by W = 1 2 L i 2 = 1 2 P N 2 i 2 = 1 2 P F

(a) Calculate the self-inductance (in mH) of a 51.0 cm long, 10.0 cm diameter solenoid having 1000 loops. (b) How much energy (in J) is stored in this inductor when 21.0 A of current flows through it Hence the energy stored in an inductor is a matter of state, meaning that if I tell you the inductance and the current as some moment in time, you can tell me the energy stored in the inductor at that same moment in time

We can now appreciate the significance of self inductance. The back-emf generated in an inductor, as the current flowing through it tries to change, effectively prevents the current from rising (or falling) much faster than the L/R time of the circuit. This effect is sometimes advantageous, but is often a great nuisance Self-inductance of a coil is numerically equal to the magnetic flux linked with the coil when the current through coil is one Ampere. Mathematically, it is given by, where, L is the constant of proportionality and is called the self-inductance. Energy stored in an inductor: Consider a source of emf connected to an inductor L The self-inductance of a circuit is 1 henry if an emf of 1 volt is induced in it when the current changes at the rate of 1 amp/sec. The energy stored in an inductor (solenoid, toroid, etc.) when there is a steady state current in it is. Proof. Mutual inductance

EE 201 inductors - 10 Inductor energy The induced magnetic ﬁeld requires energy in order for it to build up — the magnetic ﬁeld represents energy stored in the inductor. To determine the stored energy, start with power. When the inductor is amping up, the power is The change in energy due to a change in current can be found b Inductance is therefore also proportional to the energy stored in the magnetic field for a given current. This energy is stored as long as the current remains constant. If the current decreases, the magnetic field decreases, inducing a voltage in the conductor in the opposite direction, negative at the end through which current enters and. From Equation (2.48) the energy stored is given by. W = CV 2 /2 = 0.1 × 10 −6 × (400) 2 × 0.5 = 8 × 10 −3 J. Example 2.21. Calculate the current required to flow through an inductance of 0.5 H in order to store the same amount of energy as that stored by the capacitor in Example 2.20. Solution. From Equation (2.49) the energy stored is. Fall 2012 Physics 121 Practice Problem Solutions 12 Inductance Contents: 121P11 -40P , 42P, 45P, 46P , 47P , 48P, 49P, 51P, 53P, 54P, 55P • Inductors and Inductance • Self-Inductance • RL Circuits -Current Growth • RL Circuits -Current Decay • Energy Stored in a Magnetic Field • Energy Density of a Magnetic Field • Mutual Inductance The inductance of a circuit depends on the geometry of the current path as well as the magnetic permeability of nearby materials. An inductor is a component consisting of a wire or other conductor shaped to increase the magnetic flux through the circuit, usually in the shape of a coil or helix, with two terminals.Winding the wire into a coil increases the number of times the magnetic flux.

The measure of an inductor's ability to store energy for a given amount of current flow is called inductance. Not surprisingly, inductance is also a measure of the intensity of opposition to changes in current (exactly how much self-induced voltage will be produced for a given rate of change of current) A large research solenoid has a self-inductance of 25.0 H. (a) What induced emf opposes shutting it off when 100 A of current through it is switched off in 80.0 ms? (b) How much energy is stored in the inductor at full current? (c) At what rate in watts must energy be dissipated to switch the current off in 80.0 ms Calculate the inductance of an inductor. \n; Calculate the energy stored in an inductor. \n; Calculate the emf generated in an inductor. \n \n \n\n Inductors \n . Induction is the process in which an emf is induced by changing magnetic flux. Many examples have been discussed so far, some more effective than others Energy stored in Inductor. Inductors are wires wound around a core that can be made of some type of ferromagnetic material and, in many occasions, of air. Consider the self-inductance per unit.

### The current flowing through an inductor of self inductance

Energy Stored in an Inductor Consider an inductor of inductance L having initi ally zero current. It is assumed that an inductor has zero resistance so that there is no dissipation of energy with in inductor. Let I be the current at any instant of time so that di/dt is the rate of change of current self-inductance. There's no question it's a pretty goofy name for a unit, though. 15.4 Energy stored in an inductor Suppose we have an inductor that is sitting on its own, and we somehow force a current to ﬂow through it. As soon as the current level starts changing, a back EMF is induced that opposes the ﬂow of the current

### Define self inductance of a coil

Definition of Self-inductance Joseph Henry 1797 -1878 Self-inductance depends only on coil geometry It measures energy stored in the B field Recall capacitance: depends only on geometry It measures energy stored in the E fiel The self-inductance (or just inductance) of a coil is presented as where one henry of inductance means that the solenoid produces one weber of magnetic flux for each ampere of current traveling through its loops. Just like one farad is a large amount of capacitance, one henry is a large amount of inductance The current through two inductors of self-inductance 12 mH and 30 mH is increasing with time at the same rate. Draw graphs showing the variation of the (a) emf induced with the rate of change of current in each inductor (b) energy stored in each inductor with the current flowing through it. Compare the energy stored in the coils, if the power dissipated in the coils is the same

### (a) Show that the energy stored in an inductor i

1. How is the energy stored in a current-carrying inductor related to its self-inductance, L? O A. directly proportional to L directly proportional to [1/2 B. inversely proportional to L D. directly proportional to L
2. The magnetic energy stored in the inductor is E = 1 2 L I 2. When opening the switch you obviously interrupt the current I suddenly. The differential equation between voltage V L and current I through the inductor is V L = L d I d
3. An inductor is a coil consists of an insulated wire wound over an air or iron core with a fixed number of turns. It stores energy in the magnetic field when current flows through the coil. It has a property to opposes any change in the amount of current flow through the coil called inductance. The unit of inductance is Henry denoted by H

### Obtain the Expression for the Magnetic Energy Stored in an

• Energy stored in inductor = ½LI 2. The energy is used to produce the magnetic field in and around the coil. If the current is suddenly interrupted a spark may occur as the energy is dissipated. Self- inductance can be a problem in circuits, where the breaking of the circuit can induce a large e.m.f., and so the switches maybe immersed in oil.
• Mutual inductance by flux: Mutual inductance in circuits: Self-inductance in terms of magnetic flux: Self-inductance in terms of emf: Self-inductance of a solenoid: Self-inductance of a toroid: Energy stored in an inductor: Current as a function of time for a RL circuit: Time constant for a RL circuit: Charge oscillation in LC circuits: Angular.
• The self inductance of a coil is L . Keeping the length and area same, the number of turns in the coil is increased to four times. The self inductance of the coil will now b
• Self and Mutual Inductance •We define inductance L as magnetic flux/current •Here N is the number of coil turns •In multiple coil systems there is magnetic coupling between the coils -hence Mutual inductance M •Here L 12 = L 21 = M •Energy stored in multiple coils
• Energy stored in Inductor Inductors are wires wound around a core that can be made of some type of ferromagnetic material and, in many occasions, of air. They are widely used in the engineering.. ### Inductance MIT OpenCourseWare Free Online Course Material

At the self-resonant frequency, the input energy oscillates back and forth between the elements of inductance and capacitance. No more external energy is absorbed (ideal coil). If a coil is operated above its resonance, it becomes ever more capacitive. In practice, coils should be operated well below their resonant frequency Energy stored in an Inductor Energy can be stored inthe magnetic field of an inductor. Consider the circuit shown in the figure. ε=iR+L di dt If we multiply both sides of the equation we get: iE!P ε =iR2!P R +Li di dt!P L (a)i ε power the batter delivers to the circuit. (b)i2R power or rate at which thermal energy is dissipated in the. Self inductance of a coil is numerically equal to the magnetic flux linked with the coil when the current through coil is 1A. Energy stored in an inductor: Consider a source of emf connected to an inductor L. As the current starts growing, the opposing induced emf is given by e = -L(di/dt  ### Inductor MCQ Inductance MCQ Page 2 of 3 Electricalvoic

and a 10.0-H inductor are connected in series. After the current in the circuit has reached its maximum value, calculate (a) the power being supplied by the battery, (b) the power being delivered to the resistor, (c) the power being delivered to the inductor, and (d) the energy stored in the magnetic field of the inductor The field of the inductor is directly proportionate to the current provided to the inductor. Given below formula explains the energy stored in the inductor in the form of the magnetic field. E = 1/2 LI 2; In this equation. E is the amount of energy stored in the inductor. L is the self-inductance of the conductor Thus, the energy stored in the inductor is 4.26 J

### Energy stored in a Coil or Solenoid - CBSEGues

30.64 At t = 0, a battery is connected to a series arrangement of a resistor and an inductor. At what multiple of the inductive time constant will the energy stored in the inductor's magnetic field be 0.500 its steady-state value? 30.67 A solenoid that is 85.0 cm long has a cross-sectional area of 17.0 cm2. There are 950 turns of wire. Inductance (or Self Inductance) is a property of an electrical conductor which opposes a change in current. It does that by storing and releasing energy from a magnetic field surrounding the conductor when current flows, according to Faraday's law of induction Self Inductance An inductor is a circuit element that stores magnetic field. If the magnetic field is changing, i.e. the current is changing, it will have an induced EMF across it with a Energy Stored in an Inductor Recall that the EMF is defined by dW dq ε= , the work done per unit charge by a source of EMF. Power is dW dW dq P

A 24V battery is connected in series with a resistor and an inductor, where R = 8.0 W and L = 4.0H. Find the energy stored in the inductor (a) when the current reaches its maximum value and (b) one time constant after the switch is closed. (a) The maximum value of the current is I 0 = V/R = 24V / 8.0 W = 3.0A. The energy stored in the inductor. Calculate the self-inductance L of a solenoid (n turns per meter, length A, radius R) REMEMBER 1. Assume a current I is flowing in your device 2. Calculate the B field due to that I 3. Calculate the flux due to that B field 4. Calculate the self inductance (divide out I) Energy Stored in Inductor dI IR L d The energy of a capacitor is stored in the electric field between its plates. Similarly, an inductor has the capability to store energy, but in its magnetic field. This energy can be found by integrating the magnetic energy density, um = B2 2μ0 u m = B 2 2 μ

### Define self-inductance of a coil

1. Hence the use of a parallel capacitor with a large inductor, which allows slow dissipation of energy as LC oscillations (EM waves) and normal resistive heating. EDIT The said capacitance ceases to exist only if a spark discharge dissipates the gathered charge or, the instantaneous back emf is slowly reduced by resistive heating (the circuit is.
2. It is worth noting that both capacitors and inductors store energy, in their electric and magnetic fields, respectively. A circuit containing both an inductor (L) and a capacitor (C) can oscillate without a source of emf by shifting the energy stored in the circuit between the electric and magnetic fields.Thus, the concepts we develop in this section are directly applicable to the exchange of.
3. Obtain an Expression for the Energy Stored in a Solenoid of Self-inductance 'L' When the Current Through It Grows from Zero to 'I'. - Physics Obtain an expression for the energy stored in a solenoid of self-inductance 'L' when the current through it grows from zero to 'I'
4. First let's talk about self inductance. A current-carrying loop produces a magnetic field which in turn produces a flux through the loop. If this current is increased, the flux changes as the magnetic field changes and this creates a back EMF $\epsilon$ which opposes the change in current. I have heard that the work we do against this back EMF to get the current going is the energy which is.
5. Inductance L Not only magnetic materials possess a magnetic field, but every current carrying conductor also creates a magnetic field itself. Energy can be temporarily stored in the magnetic field. This effect is technically exploited in coils, consisting of one or more wire windings. The synonymous term inductor has become established

Energy Stored by an Inductance When energy flows into an inductor Energy is stored in its magnetic field When the field collapses Energy returns to the circuit No power is dissipated, so there is no power loss 2 2 1 W Li C-C Tsai 24 Example: Energy Stored by an Inductance Determine The energy stored, U in an inductor is given by Where L = self inductance I = current. Self inductance, L is the property of a circuit or circuit component which can induce an e.m.f in the circuit or component itself. The unit of self inductance is the Henry, H. 2 From Equation (2.48) the energy stored is given by. W = CV 2 /2 = 0.1 × 10 −6 × (400) 2 × 0.5 = 8 × 10 −3 J. Example 2.21. Calculate the current required to flow through an inductance of 0.5 H in order to store the same amount of energy as that stored by the capacitor in Example 2.20. Solution. From Equation (2.49) the energy stored is. With an inductor you have an absolute reference. With zero current, there is zero energy stored in the magnetic field. Energy is conserved, so whatever current goes into the inductor is converted to energy in the magnetic field. When that energy in the magnetic field is converted back into current, everything is in balance The energy stored, U in an inductor is given by Where L = self inductance I = current. • Self inductance, L is the property of a circuit or circuit component which can induce an e.m.f in the circuit or component itself. • The unit of self inductance is the Henry, H. • 2       • Chilled water piping specifications.
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