The resistance of a 40W car head lamp, drawing current from a 12V battery is ____.
- 0.3Ω
- 3.3Ω
-
3.6Ω
- 4.8Ω
The correct answer is: 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 .