When a 1500-W hair dryer is in use, the current passing through the dryer may be represented as I = (17.7A) sin (120$\pi$t). What is the rms current for this circuit?
A)17.7 A
B)12.5 A
C)85.7 A
D)25.0 A
E)8.85 A

Question

Quizplus · Accepted Answer

The rms current is calculated by dividing the peak current by the square root of 2. Therefore, I_rms = 17.7 A / √2 ≈ 12.5 A.

When a 1500-W Hair Dryer Is in Use, the Current π\piπ

When a 1500-W Hair Dryer Is in Use, the Current $\pi$