A potential difference of 12 V is applied across a resistor of 4 ohms. What current flows?
Answer and explanation
Correct answer: A. 3 A
- Step 1: Ohm's law: I = V / R. Step 2. 12 / 4 = 3 A. Answer: 3 A. Why not the others: 0.33 A inverts the ratio, 8 subtracts and 48 multiplies.
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