The power factor of a resonant series circuit is
Correct answer: A. 1
- A. 1
- B. 0
- C. -1
- D. 0.5
Explanation
At resonance, the inductive and capacitive reactances cancel each other out, making the circuit purely resistive. In a purely resistive circuit, voltage and current are in phase, resulting in a power factor (cos φ) of cos(0°) = 1.
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Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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