A pure inductive coil of 50 mH is connected to a 220 V, 60 Hz AC supply. The power consumed by the coil is.
Correct answer: A. 0 W
- A. 0 W
- B. 100 W
- C. 200 W
- D. 400 W
Explanation
A pure inductor consumes no average power (power factor cosφ = 0, as phase difference is 90°). Thus, P = VI cosφ = 0W.
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About Alternating Current
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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