A potential difference of is applied across a resistor of . What is the current (in A)?
Answer and explanation
Correct answer: D. 0.5
- Step 1: State Ohm's law relating potential difference , electric current , and resistance : .
- Step 2: Substitute the given values and : .
Answer
0.5.
Why not the others: Inverting the quotient as yields ; adds voltage and resistance; and multiplies voltage by resistance.
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