In doing a load of clothes, a clothes dryer uses 14 A of current at 240 V for 33 min. A personal computer, in contrast, uses 2.7 A of curren

Question

In doing a load of clothes, a clothes dryer uses 14 A of current at 240 V for 33 min. A personal computer, in contrast, uses 2.7 A of current at 120 V. With the energy used by the clothes dryer, how long (in hours) could you use this computer to “surf” the internet

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Neala 3 years 2021-08-21T13:03:16+00:00 1 Answers 0 views 0

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  1. thachthao
    0
    2021-08-21T13:04:32+00:00
    Reply

    Answer:

    Therefore,

    We can use Computer to surf internet for 5.7 hours.

    Explanation:

    Given:

    For Clothes Dryer,

    Current, I = 14 A

    Voltage, V = 240 V

    Time, t = 33 min = 33 × 60 = 1980 s

    For Computer,

    Current, I = 2.7 A

    Voltage, V = 120 V

    To Find:

    Time, t = ? For Computer to surf with the Energy of Clothes Dryer,

    Solution:

    According to Joule’s Law, Energy in joules for voltage “V” and Current “I” for time “t” second is given as,

    Heat\ Energy=V\times I\times t

    For Clothes Dryer

    Substituting the values we get

    Heat\ Energy=240\times 14\times 1980=6652.8\ kJ

    Now for Computer we have E = 6652.8 kJ, then time will be

    Again we have,

    Heat\ Energy=V\times I\times t

    Substituting the values we get

    6652.8\ kJ=120\times 2.7\times t\\\\t=\dfrac{6652800}{324}=20533\ s

    Time in Minutes,

    Time = \dfrac{20533}{60}=342\ min

    Time in hours again we have to divide minutes by 60

    Time = \dfrac{342}{60}=5.7\ hours

    Therefore,

    We can use Computer to surf internet for 5.7 hours.

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