A current of 3 A flows through a resistor of 20 ohms. What is the voltage across it?
Answer and explanation
Correct answer: A. 60 V
- Step 1: Ohm's law: U = I x R. Step 2. 3 x 20 = 60 V. Answer: 60 V. Why not the others: 6.7 V: resistance was divided by current. 23 V: current and resistance were added. 0.1 V: the ratio was inverted.
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