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
Verified Correct Answer: C.
Physical Principles & Numerical Solution
Power delivered to head lamp = \(\frac{V^2}{R}\) = 40W
R = \(\frac{V^2}{40}\)
= \(\frac{(12 \times 12)}{40}\) = 3.6\Omega
Source: WAEC / JAMB / NECO Classroom Archive (Record #47699)