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JAMB Physics 1983 Question 38

Question 38

Quantity of Heat

An electric current of 3 A flowing through an electric heating element of resistance 20 Ω embedded in 1,000 g of an oil raises the temperature of the oil by 10°C in 10 seconds, then the specific heat capacity of the oil is

  1. A.1.8 J/g
  2. B.0.6 J/g
  3. C.0.18 J/g°C
  4. D.1.8 J/g°C
  5. E.0.06 J/g°C
Show the answer and explanation

Answer: C (0.18 J/g°C)

Explanation

Heat = I²Rt = 9 × 20 × 10 = 1800 J. c = 1800/(1000 × 10) = 0.18 J/g°C.