9th Class Science Work and energy

  • question_answer 32)
    Find the energy in kW h consumed in 10 hours by four devices of power 500 W each.

    Answer:

    Power of each device = 500 W Number of devices = 4 Duration of use = 10 h Total energy consumed = 4 x 500 W x 10 h                                             = 20000 Wh = 20 kW h  


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