Question

If an alternating voltage is represented as E = 141 sin (628 t), then the rms value of the voltage and the frequency are respectively

• A. 141 V, 628 Hz
• B. 100 V, 50 Hz
• C. 100 V, 100 Hz
• D. 141 V, 100 Hz

Answer 1

The correct option is C 100 V, 100 Hz

$E=141sin\left(628t\right)$,
$E_{rms}=\frac{E_0}{\sqrt{2}}=\frac{141}{1.41}=100Vand2\pi f=628$
$\Rightarrow f=100Hz$