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3 September, 18:41

An electric heating element is connected to a 110 V circuit and a current of 3.2 A is flowing through the element. How much energy is used up during a period of 5 hours by the element

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  1. 3 September, 19:34
    0
    Wouldn't it be 110V * 3.2A * 5 hours?

    The problem shows 110V not 120V

    So it would be 110V * 3.2A = 352

    And 352 * 5 = 1760
  2. 3 September, 20:04
    0
    Power (rate of using energy) = (voltage) x (current)

    Power of this heating element = (120 V) x (3.2 A) = 384 watts

    The easy way:

    384 watts = 0.384 kilowatt

    (0.384 kilowatt) x (5 hours) = 1.92 kilowatt-hour

    Another way:

    384 watts = 384 joules per second.

    (384 joule/sec) x (3600 sec/hour) x (5 hours)

    = (384 x 3600 x 5) (joules) = 6,912,000 joules.
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