First slide

Alternating Current and voltage

Question

The frequency of an alternating voltage is 50 cycles/sec and its amplitude is 120V. Then the r.m.s. value of voltage is

Moderate

A

101.3V
B

84.8V
C

70.7V
D

56.5V

Solution

$V_{rms} = \frac{V_{0}}{\sqrt{2}} = \frac{120}{1 .414} = 84 .8 V$

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