During a laboratory test

PHYSICS · Subjective · CBSE · Physics · Alternating Current · Alternating Current

Problem

During a laboratory test, the voltage and current waveforms of an AC circuit with angular frequency

314\,\text{rad}\,\text{s}^{-1}

are displayed on a cathode-ray oscilloscope. It is observed that the voltage reaches its first positive maximum

2.0\,\text{ms}

before the current reaches its first positive maximum. (a) Determine the phase difference between the voltage and the current, specifying which quantity leads. (b) If the circuit draws an rms voltage of

110\,\text{V}

and an rms current of

5\,\text{A}

, calculate (i) the power factor and (ii) the average power consumed by the circuit.

Related theory

Power in AC Circuits
AC Circuit Analysis
AC Fundamentals
Mean and RMS values
Phasor representation of AC signals
Alternating Current

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