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JAMB Physics 1981 Question 49

Question 49

Electrical Energy and Power

If I is the current passing through a metallic resistor, and H is the rate of heat generated in the resistor at a constant temperature, then

  1. A.H ∝ 1/I
  2. B.H ∝ 1/I2
  3. C.H ∝ √I
  4. D.H ∝ I2
  5. E.none of the above.
Show the answer and explanation

Answer: D (H ∝ I2)

Explanation

The power (rate of heating) in a resistor is H = I²R, so at constant resistance H is proportional to I².