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12 August, 18:38

Your washer has a power of 350 watts and your dryer has a power of 1800 watts how much energy do you use to clean a load of clothes in 1 hour of washing and 1 hour of drying? A. 1.29 x 10^3 J

B. 2.58 x 10^3 J

C. 1.55 x 10^7 J

D. 7.74 x 10^6 J

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  1. 12 August, 20:32
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    7.74 x 10⁶ Joules

    Explanation:

    recall that "Watts" is the SI unit used for "energy per unit time"

    Hence "Watts" may also be expressed as Joules / Second (or J/s)

    We are given that the washer is rated at 350W (i. e. 350 Joules / s) and the dryer is rated at 1800W (i. e. 1800 Joules / s).

    We are also given that the appliances are each run for 1 hour

    1 hour = 60 min = (60 x 60) seconds = 3600 seconds

    Hence the total energy used,

    = Energy used by Washer in 1 hour + Energy used by dryer in 1 hour

    = (350 J/s x 3600 s) + (1800 J/s x 3600 s)

    = 3600 (350 + 1800)

    = 3600 (2150)

    = 7,740,000 Joules

    = 7.74 x 10⁶ Joules
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