A 2 kΩ resistor and a 0.002 µF capacitor are in series across an ac source. Current in the circuit is 6.50 mA. The true power is
A. 84.5 mW
B. 845 mW
C. 13 mW
D. 130 mW
Answer: Option A
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When the frequency of the source voltage decreases, the impedance of a parallel RC circuit
A. Increases
B. Decreases
C. Does not change
D. Decreases to zero
Due to capacitance or inductance we get reactive power (Q).
The real power (S) depends on only resistance.
therefore,
S=VI=(I^2) R
By solving we get,
S= 84.5 mA