The AC voltge and current in a house consists of two 120 V lines 180 o out of ph
ID: 1460622 • Letter: T
Question
The AC voltge and current in a house consists of two 120 V lines 180o out of phase at a frequency of 60 Hz. A 240 V 2000 W dryer, a 240 V 4000 W hot water heater, a 120 V 1000 W television, and a 120 V 400 W refrigerator are running simultaneously?
Part A - Assuming that the price per kWhr is $0.10, what is the cost of running these appliances for 3 hours?
Part B - Assuming that at t = 0 the instantaneous current is 0 A, what is the instantaneous power at ?t?? = 1 ms?
O $0.74 O $1.34 O $0.44 $4.02 O$1.32 O$2.22 2Explanation / Answer
total power = ( 2000 /2 ) + ( 4000 /2 ) + 1000 + 400 = 4400 W = 4.4 KW
cost = 4.4 * 3 * 0.1 = 1.32
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