The resistance of a 40W car head lamp, drawing current from a 12V battery is ____.
-
A.
0.3Ω -
B.
3.3Ω -
C.
3.6Ω -
D.
4.8Ω
Correct Answer: Option C
Explanation
Power delivered to head lamp = (frac{V_2}{R})
= 40W
R = (frac{V_2}{40})
= (frac{(12 × 2)}{40})
= 3.6Ω
There is an explanation video available below.