RL Series Circuit
Consider a simple RL circuit in which resistor, R and inductor, L are connected in series with a voltage supply of V volts. Let us think the current flowing in the circuit is I (amp) and current through resistor and inductor is IR and IL respectively. Since both resistance and inductor are connected in series, so the current in both the elements and the circuit remains the same. i.e IR = IL = I. Let VR and Vl be the voltage drop across resistor and inductor. Applying Kirchhoff voltage law ( i.e sum of voltage drop must be equal to apply voltage) to this circuit we get,
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