Capacitor AC Response

power007

sir, m facing a bit of problem in the current electricity. Sir, wud u plz tell me in a simple way the detailed working of capacitors n inductors under dc n ac. i hav problems wid the mechanism of a potentiometer.also i want to know the exact cause for internal resistance in a dry cell........thank u sir!!!!

edison

Capacitor AC Response

Impedance

Calculate

Contribution to complex impedance	Phasor diagram

You know that the voltage across a capacitor lags the current because the current must flow to build up the charge, and the voltage is proportional to that charge which is built up on the capacitor plates.

Capacitive Reactance

The frequency dependent impedance of a capacitor is called capacitive reactance.

This calculation works by clicking on the desired quantity in the expression below. Enter the necessary data and then click on the quantity you wish to calculate. Default values will be entered for unspecified quantities, but all quantities may be changed.

DC RESPONSE OF CAPACITOR

Charging a Capacitor

When a battery is connected to a series resistor and capacitor, the initial current is high as the battery transports charge from one plate of the capacitor to the other. The charging current asymptotically approaches zero as the capacitor becomes charged up to the battery voltage. Charging the capacitor stores energy in the electric field between the capacitor plates. The rate of charging is typically described in terms of a time constant RC.

edison

Inductor AC Response

Impedance

Contribution to complex impedance	Phasor diagram

You know that the voltage across an inductor leads the current because the Lenz' law behavior resists the buildup of the current, and it takes a finite time for an imposed voltage to force the buildup of current to its maximum.

Inductive Reactance

The frequency dependent impedance of an inductor is called inductive reactance.

This calculation works by clicking on the desired quantity in the expression below. Enter the necessary data and then click on the quantity you wish to calculate. Default values will be entered for unspecified quantities, but all quantities may be changed.

Impedance =AngularfrequencyxInductance

Inductors

Inductance is typified by the behavior of a coil of wire in resisting any change of electric current through the coil.

Arising from Faraday's law, the inductance L may be defined in terms of the emf generated to oppose a given change in current:

DC RESPONSE OF INDUCTOR

Inductor Transient

When a battery is connected to a series resistor and inductor, the inductor resists the change in current and the current therefore builds up slowly. Acting in accordance with Faraday's law and Lenz's law, the amount of impedance to the buildup of current is proportional to the rate of change of the current. That is, the faster you try to make it change, the more it resists. The current builds up toward the value it would have with the resistor alone because once the current is no longer changing, the inductor offers no impedance. The rate of this buildup is often characterized by the time constant L/R . Establishing a current in an inductor stores energy in the magnetic field formed by the coils of the inductor.

edison

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Capacitor AC Response

Capacitive Reactance

Charging a Capacitor

Inductor AC Response

Inductive Reactance

Inductors

Inductor Transient