You are cooking breakfast for yourself and a friend using a 1,200-W waffle iron

Question

You are cooking breakfast for yourself and a friend using a 1,200-W waffle iron and a 500-W coffee maker. Usually, you operate these appliances from a 110-V outlet for 0.500 hour each day.

(a) At 25 cents per kWh, how much do you spend to cook breakfast during a 30.0-day period?

(b) You find yourself addicted to waffles and would like to upgrade to a 2,400-W waffle iron that will enable you to cook twice as many waffles during a half-hour period, but you know that the circuit breaker in your kitchen is a 20-A breaker. Can you do the upgrade?

Explanation / Answer

(a) Total energy consumed in 30 days = (1200+500)*0.5*30 Wh = 25500 Wh = 25.5 kWh

Cost = 25*25.5 = 637.5 cents = 6.375 dollars

(b) Current required for waffle iron = P/V = 2400/110 = 21.81 A which is greater than circuit breaker rating. Therfore upgrade is not possible.

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