Question

The instantaneous value of an AC is given by $I=5sin(\omega t+\varphi )amp$. The rms value of current is

• A. $5A$
• B. $\frac{5}{\sqrt{2}}A$
• C. $5\sqrt{2}A$
• D. $2.5A$

Answer 1

The correct option is B $\frac{5}{\sqrt{2}}A$

For a sinusoid, rms value is given by

$I_{rms}=\frac{I_0}{\sqrt{2}}=\frac{5}{\sqrt{2}}$