Calculate the energy transferred by a 12V hairdryer, running on a current of 0.50A, that is left on for 8.0 minutes.

Question

Calculate the energy transferred by a 12V hairdryer, running on a current of 0.50A, that is left on for 8.0 minutes.

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Thu Thảo 5 years 2021-08-19T12:10:47+00:00 2 Answers 22 views 0

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  1. Tryphena
    0
    2021-08-19T12:12:31+00:00
    Reply

    Answer:

    Energy = 0.8 W•hr

    Explanation:

    Energy delivered is 12 V(0.50)A(8.0/60)hr = 0.8 W•hr

    This is often confused with the power consumption which is calculated using the same numbers, but in a different way for a different purpose

    The power consumption rate is 12V(0.50 A) = 6 W or 6 J/s

    working for 8 minutes means a total power consumption of

    6 J/s(8 min(60 s/min)) = 2880 J

    Energy is what the power company bills you for

    It is usually sold in units of kW•hrs.

  2. lethu
    0
    2021-08-19T12:12:32+00:00
    Reply

    Step 1
    List all the information in symbol form and change into appropriate and consistent SI units if required.
    V=12V
    I=0.5A
    t = 8.0 minutes
    = 8 × 60
    = 480s
    E=?
    Step 2
    Use the correct formula.
    E=IVt
    Step 3
    Calculate the answer by putting the numbers into the formula.
    E = IVt
    = 0.5 × 12 × 480
    = 2880J
    The answer is 2880J 🙂 hope this helps!

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