Question

The voltage of an AC source varies with time according to the relation: ` E = 120 sin 100 pi t cos 100 pi t V`. What is the peak voltage of the source?
A. 60 V
B. 120V
C. 30V
D. `sqrt(2)V`

Answer 1

Correct Answer - A
`E=120 sin 100 pi t cos 100 (pi)t=60 sin(200 pi t)`
So peak voltage `E_(0)=60V`.