Q. A bulb is connected first with dc and then ac of same voltage it will shine brightly with
A) AC
B) DC
C) Brightness will be in ratio 1/1.4
D) Equally with both
Explanation
(d) Brightness $\propto P_{consumed} \propto \frac{1}{R}$. For bulb, $R_{ac} = R_{dc}$, so brightness will be equal in both the cases
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.