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A coffee maker is rated at 1230 W, a toaster at 1120 W, and a waffle maker at 1430 W. The three appliances are connected in parallel to a common 120 V household circuit.

(a) What is the current in each appliance when operating independently?

coffee maker A
toaster A
waffle maker A

(b) What total current is delivered to the appliances when all are operating simultaneously?
A

(c) Is a 15-A circuit breaker sufficient in this situation? Explain.
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Added Tue, 04 Aug '15
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P=VI
where p=power in watt
V=voltage/potential difference
I=current

Since it is parallel combination voltage across each remains the same


a)
coffee maker
I=P/V =1230/120=10.25A

toaster
I=P/V=1120/120=9.333A

waffle maker
I=P/V=1430/120=11.916A

b)total current is delivered to the appliances when all are operating simultaneously is the sum of individual currents
= 10.25+9.333+11.916=31.499A~ 31.50A

c) So 15 amp circuit breaker will not do , at least 32 amp wire will be required.
Edit
Added Tue, 04 Aug '15
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