Coffee Makers Rating
Monday, September 5th, 2011
physics problem- A coffee maker is rated at 1210 W, a toaster at 1010 W, and a waffle maker at 1410 W. The thr?
A coffee maker is rated at 1210 W, a toaster at 1010 W, and a waffle maker at 1410 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?
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 =1210/120=10.083A
toaster
I=P/V=1010/120=8.416A
waffle maker
I=P/V=1410/120=11.75A
b)total current is delivered to the appliances when all are operating simultaneously is the sum of individual currents
= 10.083+8.416+11.75=30.249A
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