Question

An electric bulb marked 25 W and 100 V is connected across 50 V supply. Now its power is
(1) 25 W
(2) 12.5 W
(3) 6.25 W
(4) 50 W​

Answer 1

Answer:

(1) one one is the right answer

Answer 2

P=V2/R

R=10000/25

R=400

P1=V1²/R

P1=2500/400

P1=6.25

I hope this helps (θ‿θ)