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

Question

The frequency of an alternating voltage is 50 cycles/sec and its amplitude is 120 V. Then the r.m.s. value of voltage is (A) 101.3 V (B) 84.8 V (C) 70.7 V (D) 56.5 V

Tardigrade Admin · Accepted Answer

V rms =(V0/√2) =(120/1.414)=84.8 V

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

101.3 V

84.8 V

70.7 V

56.5 V

$V_{r m s} = \frac{V _{0}}{2}$
$= \frac{120}{1.414} = 84.8 V$

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

101.3 V

84.8 V

70.7 V

56.5 V

Vrms​=2​V0​​ =1.414120​=84.8V

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

$V_{r m s} = \frac{V _{0}}{2}$
$= \frac{120}{1.414} = 84.8 V$