First slide

Alternating Current and voltage

Question

An electric lamp is connected to 220 V, 50 Hz supply. Then the peak value of voltage is

Moderate

A

210 V
B

211 V
C

310 V
D

320 V

Solution

$V_{0} = V_{rms} \times \sqrt{2} = 220 \times \sqrt{2} = 310$

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