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NEET 1995 (AIPMT) · Power, Power Factor & Wattless Current

Power, Power Factor & Wattless Current question from NEET 1995 (AIPMT)

Q82NEET 1995 · AIPMTEasy

Power, Power Factor & Wattless Current

In an A.C. circuit, the current flowing is $I = 5\sin(100t - \pi/2)$ ampere and the potential difference is $V = 200\sin(100t)$ volts. The power consumption is equal to

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Answer: (b)

Current lags voltage by $\phi = \frac{\pi}{2}$ .
$P = \frac{V_0I_0}{2}\cos 90^\circ = 0$ (wattless current)
So the answer is (b) 0 W.

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