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?

  • N28
  • N12 checkmark
  • N16
  • N24

The correct answer is: 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

There is an explanation video available .

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