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JAMB Physics 1992 Question 42

Question 42

Current Electricity

The heat produced in a conductor carrying an electric current is

  1. A.inversely proportional to the current and the resistance
  2. B.directly proportional to the current, resistance and the time
  3. C.inversely proportional to the square of the resistance, current and the time
  4. D.directly proportional to the square of the current, the resistance and the time.
Show the answer and explanation

Answer: D (directly proportional to the square of the current, the resistance and the time.)

Explanation

Joule's law: heat H = I2Rt.