The average power input to a series alternating current circuit is minimum when
A. there are only a resistor and capacitor in the circuit.
B. there are only a resistor and inductor in the circuit.
C. there is only a resistor in the circuit.
D. XL = XC and the circuit contains a resistor, an inductor and a capacitor.
E. there is only a capacitor in the circuit.
Answer: E
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