You need to purchase a motor to supply 400 joules [J] in 10 seconds [s]. All of the motors you can choose from are 80% efficient. What is th

Question

You need to purchase a motor to supply 400 joules [J] in 10 seconds [s]. All of the motors you can choose from are 80% efficient. What is the minimum wattage [W] on the motor you need to choose

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Edana Edana 1 year 2021-09-01T21:15:17+00:00 1 Answers 0 views 0

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    2021-09-01T21:17:12+00:00

    Answer:

    32 W.

    Explanation:

    Power: This can be defined as the ratio of energy to time. The S.I unit of power is watt(W). The formula for power is given as,

    P = W/t……………….. Equation 1

    Where P = power, W = work done, t = time.

    Given: W = 400 J, t = 10 s.

    Substitute into equation 1

    P = 400/10

    P = 40 W.

    If the motors that is choose is 80% efficient,

    P’ = P(0.8)

    Where P’ = minimum power

    P’ = 40(0.8)

    P’ = 32 W.

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