A generator produces a time varying voltage given by `V=240 sin 120 t,` where `t` is in second. The rms voltage and frequency are

Options

A. `60 Hz` and `240 V`
B. `19 Hz` and `120 V`
C. `19 Hz` and `170 V`
D. `754 Hz` and `170 V`

Answer

3

Explanation

`V = V_(m) sin omega t` compare to given equation, we get
`V_(m) = 240` and `omega = 120`
`f = (omega)/(2 pi) = (120)/(6.28) = 19 H_(2)` and
voltage `= (V_(m))/(sqrt(2)) = (240)/(sqrt(2)) = 170 V`