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17 July, 02:34

Calculate How much energy is transferred as useful energy

=A 98% efficient kettle that has a total input of 2000J

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Answers (2)
  1. 17 July, 03:08
    0
    Answer:1960j

    Explanation:

    total input energy=2000j

    98% of total input energy is useful

    98% of 2000

    98/100 x 2000

    (98 x 2000) ➗ 100

    196000 ➗ 100=1960

    1960j is useful
  2. 17 July, 05:13
    0
    "Efficiency" just means that's how much of the input energy comes out useful.

    For this kettle, it's 98%. That means that whatever amount of energy you put into the kettle, 98% of it comes out useful.

    98% of 2,000 Joules is (0.98) x (2000J). That's 1,960 Joules.
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