Question

An alternating current having peak value $14A$ is used to heat a metal wire. To produce the same heating effect, a constant current $I$ can be used. Then, the value of $I$ must be

• A. $14A$
• B. about $20A$
• C. about $10A$
• D. $7A$

Answer 1

The correct option is C about $10A$

$I_{rms}=\frac{Peakvalue}{\sqrt{2}}$
$=\frac{14}{\sqrt{2}}=9.9A$