A 10 Ω electric heater is connected to a 220 V, 50 Hz mains supply. What is the peak potential difference across the heater element?
Correct answer B. 220√2 V
Explanation
Mains voltage of 220 V is an r.m.s. value. For a sinusoidal supply the peak is √2 times larger, V₀ = 220√2 ≈ 311 V.
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