answersLogoWhite

0


Want this question answered?

Be notified when an answer is posted

Add your answer:

Earn +20 pts
Q: What amount of energy is stored in a 4.7mH inductor when the current is 20mA?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

During the first quarter cycle energy is given to an inductor. and the same amount of energy is returned by the inductor during the next quarter cycle .then how is energy stored in inductor?

Well, first of all, nobody ever claimed that the energy is stored 'in the inductor'.The energy is stored in the inductor's magnetic field.Next: When they say that energy is stored, it doesn't necessarily mean that it'sstored like in a box or a jar, and you can fill it up, put it up on the shelf, then comeback and get it in a few days.The energy stored in the magnetic field is steady as long as the current through theinductor is steady. If the current is changing, then the energy in the magnetic fieldis also changing. When the energy in the magnetic field is decreasing, then of coursethe magnetic field is returning some of its stored energy to the circuit, by way of thecurrent.


What type of energy stored in inductor?

heat energy


Equaction of energy related to inductor?

Energy stored in the inductance 'L' through which the current 'I' flows is [ 1/2 L I2 ].


What is the initial condition of the elements capacitor and inductor that have no initial energy stored?

The initial condition of a capacitor that has no energy stored is zero volts. The initial condition of an inductor that has no energy stored is zero amperes.


Suppose no energy given to inductor and a decreasing current is applied to it. emf will be produced and energy is given by it.so i think energy is not stored in inductor. it is its own property?

How do you propose to connect a decreasing current to the inductor ? The initial current through the inductor is zero, and you want to connect it to a current which is not zero and decreasing. At the instant you make the connection, the inductor current is zero, and it must rise to the non-zero value where you want it to begin decreasing. The current in the inductor cannot change from zero to something in zero time. As it rises from zero to the initial value, guess what . . . the inductor is storing energy in its magnetic field, while producing the usual voltage equal to [ L di/dt ].


Energy is stored in inductor in magnetic field.magnetic field exists only where the charge is moving.so does the moving charge is stored in an inductor.if not then how is energy stored in inductor?

the energy is stored in the magnetic field surrounding the inductor, which takes time to build up and time to collapse. when current is first applied, the absence of magnetic field opposes it until the field has built up. when current is removed, the built up magnetic field opposes it forcing current to flow until the field has collapsed.nothing happens instantly when dealing with fields, either magnetic or electrostatic.


What is the reason behind the lag of current in inductor lead in capacitor?

The physics of the energy storage. In an inductor, the current must fight against the stored energy in the magnetic field which tries to keep the current unchanged. Any change in the current lags the voltage since the stored energy impacts the adjustment. Similarly, the "displacement" current in a capacitor leads the electric field buildup in a capacitor, causing the voltage to lag the current until the stored energy building up in the electric field stabilizes. Any change in the voltage is first preceded by a change in the displacement current.


What is the unit of energy of inductor?

I am not entirely sure what you mean. Energy is measured in joules. The energy stored in an inductor would therefore also be measured in joules. The "strength" of an inductor is measured in henry, but that is not an energy unit.


Does an inductor absorb electrical energy?

Yes, both capacitors and inductors are capable of storing energy. Capacitors store electrical energy in form of electrical charge and inductors in form of magnetic field. - Neeraj Sharma


What is the energy stored in a 32 mH inductor that carries a current of 5 amps?

.4 mjAnswerAssuming the current is constant, then the energy stored is given by:W = 0.5 LI2 = 0.5 x (32 x 10-3) x 5 = 80 mJ


Why do inductors resists a change in current?

An inductor charges and discharges. When an alternating current come up, the positive signal of the current quickly charges up the inductor. when the negative signal part of the same cycle comes up the inductor develops a potential to opposes it. this is because any charge developed opposes if there is a change or break or whatever for that matter, in supply. so, the negative signal which is basically a change in signal when approaches the inductor the charge developed across it opposes it and as the charge developed thanks to the positive part of the signal is used up to oppose the negative part of the same signal, basically the charge is zero. thus an alternating current or high frequency current for that matter, does not pass through an inductor.CommentI think the above answer has confused inductance for capacitance! No charges are involved with inductors.Whenever current changes in an inductive circuit, a voltage is induced into that circuit. The magnitude of the induced voltage depends on the rate of change of current. The direction of the induced voltage is such that it opposes the change in current -for example, if the current is reducing in value, then the induced voltage will try to maintain that current.


What happens when a inductor charges and then discharges?

AnswerWhen you connect DC voltage to an inductor, it opposes the passage of current, which generates a voltage pulse the is several times the value of the applied voltage. When you disconnect the voltage, the electromagnetic field inside the inductor collapses and all the energy it stored is released to the circuit in the form of another large pulse, but this time with opposite polarity.Remember:Inductors oppose changes in current and they store energy in an electromagnetic field.Capacitor oppose changes in voltage and they store energy in an electrostatic field.