Two resistors of and are connected in parallel. What is the equivalent resistance (in )?
Answer and explanation
Correct answer: B. 6
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- Step 1: The equivalent resistance of two resistors connected in parallel is given by .
- Step 2: Substitute and : .
- Step 3: Divide numerator by denominator: .
Answer
6.
Why not the others: '5' adds rather than subtracts the constant term in the final step in evaluating ; '25/2' takes the arithmetic mean of the two resistors rather than reciprocal sum; '25' adds the resistances in series () rather than parallel.
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