Questions on DC Circuit _ Electrical4u

2/29/2016

Questions on DC Circuit | Electrical4u

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When a simple resistor of R ohms is connected across a DC source of voltage V volts, the current V/R ampere starts flowing instantly without any delay. But if an inductor is connected across the DC source, current will not start to flow with its full value at the instant of connection of the source. This is because of presence of inductance in the coil. As soon as the voltage is applied across the inductor, current starts rising from 0 to its final value and during this change of current there will be an induced EMF across the coil which opposes the applied voltage and hence opposes the rapid rise of current instead it takes a finite time to reach the maximum value that is V/R where R is the resistive value of the inductor and V is the applied voltage across the inductor.

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