Question

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

• A. 2 A
• B. $\sqrt2 \,A$
• C. $2\sqrt2 \,A$
• D. zero

Answer 1

Answer: (B)

$\sqrt2 \,A$

Answer 2

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