Question

two bulb A and B
rated as 90w-120vand 60w-120v respectively . they are connected in parallel across a 120 v source .find the current in each bulb . which bulb consume more energy.

Answer 1

In Electric Bulb A:

Electric Power (P1)= 90W
Potential Difference (V1)= 120V

Current (I)= P1/V1 [Since, P=VI]
= 90/120= 0.75A

In electric bulb B:
P2=60W
V2=120V

I2= P2/V2= 60/120= 0.50 A

Energy consumed by Bulb A is more than Bulb B because P1>P2