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30 April, 09:38

Compare the energy consumption of two commonly used items in the household. calculate the energy used by a 1.20 kw toaster oven, wtoaster, which is used for 6.20 minutes and then calculate the amount of energy an 11.0 w compact fluorescent light (cfl), wlight, bulb uses when left on for 8.50 hours.

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  1. 30 April, 10:23
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    we know energy = power*time (in hour) so energy used by 1.20kw (1200 watt) toast oven used for 6.2 min (6.2/60 hour) = 1200 * (6.2/60) = 1200*0.103 = 124 watt hour. Energy used by 11 w cfl used for 8.50 hour = (11*8) + (11 * (50/60)) = 88+9.166=97.166 watt hour.
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