Question

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

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

Answer 1

Answer: (C)

$100V,100Hz$

Answer 2

$E = 141\sin(628t),$

$E_{rms} = \frac{E_{0}}{\sqrt{2}} = \frac{141}{1.41} = 100V$ and $2\pi f = 628$

⇒ $f = 100Hz$