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21 June, 14:14

A generator does work on an electric heater by forcing an electric current through it. Suppose 1 kJ of work is done on the heater and in turn 1 kJ of energy as heat is transferred to its surroundings. What is the change in internal energy of the heater?

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Answers (2)
  1. 21 June, 15:59
    0
    The change in internal energy of the heater is 0 kJ

    Explanation:

    ∆U = Q - W

    Q is quantity of heat transferred = 1 kJ

    W is work done on the heater = 1 kJ

    Change in internal energy (∆U) = 1 - 1 = 0 kJ
  2. 21 June, 18:07
    0
    -2 kJ.

    Explanation:

    Given:

    ∆Q = 1 kJ

    W = 1 kJ

    Using the first law of thermodynamics in application to conservation of energy,

    ∆U = ∆Q - W

    Where,

    ∆U = change in internal energy

    ∆Q = heat supplied to the system

    W = workdone by the system

    ∆U = - 1 - 1

    = - 2 kJ.
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