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29 October, 10:51

Undersoil electrical heating systems are used in greenhouses. This system could also be

used under a road.

A cable just below the ground carries an electric current. One greenhouse system has a

power output of 0.50 kW.

Calculate the energy transferred in 2 minutes.

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Answers (1)
  1. 29 October, 11:18
    0
    Answer:t

    Explanation:

    Given that,

    Power output is

    P = 0.50kW = 0.5 * 1000 = 500W.

    We want to find energy transfer in

    t = 2minutes = 2 * 60 = 120 seconds

    Also, time to hour

    t = 2/60 = 1/30 hour

    Power is the rate of energy.

    Therefore,

    Power = energy / time taken

    Energy = power * time taken

    Energy = 0.5kW * 1/30 hr

    Energy = 0.01667 kWh

    Also, energy in Joule

    Energy = power * time

    Energy = 500W * 120s

    Energy = 60,000J

    Energy = 60kJ.
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