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

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

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Important Questions on Alternating Current

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Assertion: An alternating current of frequency 50 Hz becomes zero, 100 times in one second.

Reason: Alternating current changes direction and becomes zero twice in a cycle.

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Assertion : An alternating current is more dangerous than a direct steady current.
Reason : The frequency of the alternating current is injurious to the human body. 
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Assertion :- A sinusoidal alternating current does not show any average magnetic effects.
Reason :- The average value of an alternating current is zero.
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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.

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Assertion: In a series LCR circuit, the impedance is minimum at resonance.
Reason: The currents in inductance and capacitance are same and voltage out of phase at resonance in series LCR circuit.
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For series RLC circuit, the graph between current and frequency of voltage source is shown in figure.

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Assertion: Nature of circuit in region 1 is capacitive while in region 2 is inductive.

Reason: Power factor of circuit in region 1 is negative and in region 2 is positive.

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Assertion: In series LCR circuit, the phase difference between current and voltage is never zero.

Reason: Voltage and current are never in phase.

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Assertion: A capacitor is used to minimise power loss.

Reason: A capacitor alters the phase voltage.