Physics
Grade-9
Easy

Question

A certain appliance requires 2,141 watts. How much would it cost to run the appliance for a total of 27 minutes at a cost of Rs 12 per kWh?

  1. Rs 11.52
  2. Rs 12
  3. Rs 11
  4. Rs 10.52

hintHint:

fraction numerator E n e r g y left parenthesis k w right parenthesis over denominator t i m e left parenthesis h o u r right parenthesis end fraction=Power

The correct answer is: Rs 11.52


    • Power = fraction numerator E n e r g y left parenthesis k w right parenthesis over denominator t i m e left parenthesis h o u r right parenthesis end fraction
    • power=fraction numerator 2141 divided by 1000 over denominator 27 divided by 60 end fraction equals 4.75 space k w h
    • so total cost =4.75 *12=Rs 57

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