Question

When connected to a 12V battery, the current in a car headlight is 4.0 A.

When the lamp is lit, what is its resistance?

A) 3.0 ohms
B) 16 ohms
C) 48 ohms
D) 0.33 ohms

Answer 1

3Ω

Step-by-step explanation:

we are here given that,

• voltage= 12V
• current= 4A
• resistance= ?

From Ohm's law , we know that,

`\implies V = iR \\`

where ,

• v is potential difference
• i is current
• R is resistance

on substituting the respective values, we have,

`\implies 12V = 4A(R) \\`

`\implies R =(12V)/(4A) \\`

`\implies \underline{\underline{ R = 3\Omega}} \\`

and we are done!