Electricity is supplied to a school along a cable of total resistance 0.5\(\Omega\) with the...
PHYSICS
JAMB 1998
Electricity is supplied to a school along a cable of total resistance 0.5\(\Omega\) with the maximum current drawn from the mains as 100A. The maximum energy dissipated as heat for 1 hr is
- A. 3.6 x 103J
- B. 5.0 x 103J
- C. 3.0 x 105J
- D. 1.8 x 107J
Correct Answer: D. 1.8 x 107J
Explanation
Elect. energy = I2Rt
= 100 x 100 x 0.5 x 3600
= 1.8 x 107J
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