Question

If the instantaneous current in a circuit is given by $I=2cos(\omega t+\phi )$ amperes, the rms value of current is

• A. 2 A
• B. $\sqrt{2}$ A
• C. $2\sqrt{2}$ A
• D. zero

Answer 1

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

$RMSvalue=\frac{2}{\sqrt{2}}=\sqrt{2}A$