A light bulb has a resistance of 360 . What is the current in the bulb when it has a potential difference of 120 V across it? A 0.33 A B 3 A C 480 A D 43,200 A

Question

asked Mar 26, 2018 127k views

2 Answers

Elar · Answer 1 · 2018-03-31T11:16:20+0000

The correct answer is option A. 0.33A.

According to the Ohm's Law, The current across the two points is directly propotional to the voltage and the equation is given below.

V ∝ i (v is voltage or potential difference and i is current)

V = iR ( Resistance)

Resistance is a constant, which is independent of the value of the current.

Given,

R = 360

V= 120 V

Putting value of R and V in V =iR

120 = 360 i

$(120)/(360) =i\\(1)/(3) =i\\i=0.33A$

Hence, the current in the bulb will be 0.33 A (ampere).