alleryA potential difference of 12 V drives a current of 3 A through a resistor. The resistance is:
A0.25 Ω
B4 Ω
C9 Ω
D36 Ω
Answer & Solution
Correct answer: B. 4 Ω
1. R = V / I.
2. = 12 V / 3 A = 4 Ω.
3. Power dissipated: P = VI = 36 W.
_Source: syllabus Science Ch 11 §11.3 (basic Ohm's law application)_
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