Question

a torch bulb is rated 1.5V ,500mA .the resistance of the bulb is
A) 5ohm
B) 3ohm
C) 1.5ohm
D) 2ohm​

Answer 1

Explanation:

v = 1.5 v

I = 500mA = 500*10^-3A

R = V/I

R = 1.5 / 500*10^-3

R = 1.5 / 0.5

R = 3ohm

Answer 2

Answer :

Voltage = 1.5 volt

Current flow = 500mA = 0.5$\sf{A}$

We have to find resistance of torch bult.

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As per ohm's law, current passing through a conductor is directly proportional to the applied potential difference.

• V = IR

➝ V = IR

➝ 1.5 = 0.5 × R

➝ R = 1.5/0.5

➝ R = 3Ω

Option-B is the correct answer!