
Assertion: In series AC circuit, voltage leads the current.
Reason: In series AC circuit, current leads the voltage.


Important Questions on Alternating Current
Assertion: An alternating current of frequency becomes zero, times in one second.
Reason: Alternating current changes direction and becomes zero twice in a cycle.

Reason : The frequency of the alternating current is injurious to the human body.

Reason :- The average value of an alternating current is zero.

Assertion: DC and AC both can be measured by a hot wire instrument.
Reason: The hot wire instrument is based on the principle of heating effect of current.

Reason: The currents in inductance and capacitance are same and voltage out of phase at resonance in series circuit.

For series circuit, the graph between current and frequency of voltage source is shown in figure.
Assertion: Nature of circuit in region is capacitive while in region is inductive.
Reason: Power factor of circuit in region is negative and in region is positive.

Assertion: In series circuit, the phase difference between current and voltage is never zero.
Reason: Voltage and current are never in phase.

Assertion: A capacitor is used to minimise power loss.
Reason: A capacitor alters the phase voltage.
