You are cooking breakfast for yourself and a friend usinga 1140 W waffle iron an

Question

You are cooking breakfast for yourself and a friend usinga 1140 W waffle iron anda 480 W coffeepot. Usually,you operate these appliances from a 110 V outlet for 0.500 h eachday.
(a) At 12 cents per kWh, how much do you spend to cook breakfastduring a 30.0 day period?
$
(b) You find yourself addicted to waffles and would like to upgradeto a 2280 W waffle iron thatwill enable you to cook twice as many waffles during a half-hourperiod, but you know that the circuit breaker in your kitchen is a20 A breaker. Can you do the upgrade?
---Response---YesNo
Give the current that this new waffle iron (along with the coffeepot) draws to support your answer.
I = A (a) At 12 cents per kWh, how much do you spend to cook breakfastduring a 30.0 day period?
$
(b) You find yourself addicted to waffles and would like to upgradeto a 2280 W waffle iron thatwill enable you to cook twice as many waffles during a half-hourperiod, but you know that the circuit breaker in your kitchen is a20 A breaker. Can you do the upgrade?
---Response---YesNo
Give the current that this new waffle iron (along with the coffeepot) draws to support your answer.
I = A

Explanation / Answer

Part a: Total watts = 1140+480 = 1620 W = 1.62 KW Total time = 0.5*30 = 15 hours So monthly KWh = 1.62*15 = 24.3 KWh Total cost for a month = 24.3*0.12 = $ 2.916 = $ 2.92 Part b: Current drawn from power supply by Waffle iron = Watts/Volts =2280/110 = 20.72 A As this is more than the domestic circuit breaker currentlimit, Response will be No to upgrade. Part c: Current by new Waffle Iron = 20.72 A Current by Coffee pot = 480/110 = 4.4 A So the total current = 20.72+4.36 = 25.08 A

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