Q. An ac supply gives $30\ V\ r.m.s.$ which passes through a $10\ \Omega$ resistance. The power dissipated in it is
A) $90\sqrt{2}\ W$
B) $90\ W$
C) $45\sqrt{2}\ W$
D) 45 $W$
Explanation
(b) $P = \frac{V_{rms}^{2}}{R} = \frac{(30)^{2}}{10} = 90\ W$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.