Question

Refer to the figure and the discussion of lights dimming when a heavy appliance comes on. 
(a) Given the voltage source is 120 V, the wire resistance is 0.400 Ω , and the
bulb is nominally 75.0 W, what power will the bulb dissipate if a total of 15.0 A passes through the wires when the motor comes on? Assume negligible change in bulb resistance. 
(b) What power is consumed by the motor?

Retrigerator
Low P.
R.
Large IR
drop in wires
Bulb
dims
R, = wire
Low R
draws large /,
resistance
ww
Motor
Figure 21.7 Why do lights dim when a large appliance is switched on? The answer is that the large current the appliance motor draws causes a
significant IR drop in the wires and reduces the voltage across the light.
Expand
Transcribed Image Text

Retrigerator Low P. R. Large IR drop in wires Bulb dims R, = wire Low R draws large /, resistance ww Motor Figure 21.7 Why do lights dim when a large appliance is switched on? The answer is that the large current the appliance motor draws causes a significant IR drop in the wires and reduces the voltage across the light.

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