Suppose that the electricity in your home has goneout and the power company will not be able to haveyou hooked up again for several days. The freezer inthe basement contains several hundred dollars’ worthof food that you cannot afford to let spoil. You havealso been experiencing very hot, humid weather andwould like to keep one room air-conditioned with awindow air conditioner, as well as run the refrigeratorin your kitchen. When the appliances are on, they drawthe following currents (all values are rms):Air conditioner: 9.6 A@ 120 V pf = 0.90 (lagging)Freezer: 4.2 A@ 120 V pf = 0.87 (lagging)Refrigerator: 3.5 A@ 120 V pf = 0.80 (lagging)In the worst-case scenario, how much power must anemergency generator supply?
Suppose that the electricity in your home has gone
out and the power company will not be able to have
you hooked up again for several days. The freezer in
the basement contains several hundred dollars’ worth
of food that you cannot afford to let spoil. You have
also been experiencing very hot, humid weather and
would like to keep one room air-conditioned with a
window air conditioner, as well as run the refrigerator
in your kitchen. When the appliances are on, they draw
the following currents (all values are rms):
Air conditioner: 9.6 A@ 120 V
pf = 0.90 (lagging)
Freezer: 4.2 A@ 120 V
pf = 0.87 (lagging)
Refrigerator: 3.5 A@ 120 V
pf = 0.80 (lagging)
In the worst-case scenario, how much power must an
emergency generator supply?
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