A heater of resistance is connected to a supply. What is the power consumed (in W)?

Answer and explanation

Correct answer: C. 48

  1. Step 1: Note the given electrical values: supply potential difference and heating element resistance .
  2. Step 2: Use Joule's power relationship in terms of voltage and resistance: .
  3. Step 3: Calculate the electrical power consumed: .
Answer
48.
Why not the others: 288, 24 and 2 do not fit.

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