Question 44
Electrical Energy and PowerElectricity is supplied to a school along a cable of total resistance 0.5 Ω with the maximum current drawn from the mains as 100 A. The maximum energy dissipated as heat for 1 hr is
- A.3.6 × 103 J
- B.5.0 × 103 J
- C.3.0 × 105 J
- D.1.8 × 107 J
Show the answer and explanation
Answer: D (1.8 × 107 J)
Explanation
H = I2Rt = 1002 × 0.5 × 3600 = 1.8 × 107 J.