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If the charge of electricity is K wh is N4, what is the cost of...

Physics
JAMB 2011
If the charge of electricity is K wh is N4, what is the cost of operating an electrical appliance rated 250 v,2 A for six hours?
  • A. N28
  • B. N12
  • C. N16
  • D. N24
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Correct Answer: Option B
Explanation
Energy consumed = power x time = lvt = 2 x 250 x 6hr = 300 wh = 3 kwh but 1 kwh = N4
3 kwh = 3 x N4 = N 12

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