Question

A bulb marked 25 W and another 40 W, which one has a higher resistance if both are to be used at 220V in domestic circuit in parallel

Answer 1

ANSWER:

25 WATT BULB

EXPLANATION:

P=$\frac{V²}{R}$

R=$\frac{V²}{P}$

FOR 25 WATT BULB➡

R=$\frac{220²}{25}$

R=$\frac{48,400}{25}$

R=1,936Ω

FOR 100 WATT BULB➡

R=$\frac{220²}{100}$

R=$\frac{48,400}{100}$

R=484Ω

25 WATT BULB HAS HIGHER RESISTANCE.

Answer 2

Answer:

25 WATT BULB HAS HIGHER RESISTANCE