A battery is connected across two resistors in parallel: and , which are in series with . What is the total power dissipated in the circuit?
Answer and explanation
Correct answer: A.
- Step 1: Compute parallel equivalent resistance: .
- Step 2: Add series resistor: .
- Step 3: Total current: .
- Step 4: Total power dissipated: (or ).
Answer
24 W.
Why not the others: '' uses ; '' miscalculates parallel resistance; '' ignores series resistance.
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