Question

If the equation of $AC$ in an $AC$ circuit is $I=200\cos (\omega t+\theta )$ ampere, then the effective value of current will be

• A. $\frac{200}{\sqrt{2}}A$
• B. $200\sqrt{2}a$
• C. 200 A
• D. 0

Answer 1

The correct option is A $\frac{200}{\sqrt{2}}A$

$I=200\cos (\omega t+\theta )$

$I_{peak}=200$

Effective value of current $=I_{rms}=\frac{I_{peak}}{\sqrt{2}}=\frac{200}{\sqrt{2}}$