Question

a) When an alternating voltage of 210 V is applied across a device X, a current of 0.9A flows through the circuit, but it leads the applied voltage by n/2radians. When the same voltage is applied across another device Y, the same current again flows through the circuit, but it lags behind the applied voltage by T/2radians. Name the devices X and Y. Justify your answer.

Answer 1

Device X is a capacitive load, the current leads the voltage in a capacitor because a discharged capacitor is like a closed wire current flows through it freely but voltage builds up across it in some time. Any load system that is capacitive in nature will exhibit the same nature.

Devicw Y is an inductive load. The voltage leads the current in an inductor because, voltage appears instantly across an inductor but since inductor opposes any change in current, the total current builds up slowly through the inductor.