Question

If an alternating voltage is represented as $E=141\sin \left(628t\right)$ then the r.m.s value of the voltage and the frequency are respectively

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

Answer 1

The correct option is A $100V,100Hz$

Given,

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