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19.82. Set Up:
Use a network of resistors that has
Each resistor can dissipate less than 2.00 W but
the total power is the sum of the powers for each resistor so it can be 2.00 W.
Solve: (a)
and
(b)
One possible network is two in parallel in series with two in parallel, as shown in Figure 19.82.
Each parallel combination has an equivalent resistance of
so these two units in series have an equivalent resist
ance of
The current is the same in each resistor so each resistor dissipates the same power. If each resistor
dissipates 0.50 W, then the network dissipates 2.00 W. Other combinations also give the desired resistance and power
rating, such as two in series in parallel with two in series.
Figure 19.82
19.83. Set Up:
Since they are in parallel, the voltage across each device is 120 V.
The total current drawn
from the outlet is the sum of the individual currents.
Solve: (a)
Toaster:
Frypan:
Lamp:
(b)
This is greater than 20 A and the circuit breaker will blow.
19.84. Set Up:
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This note was uploaded on 03/06/2009 for the course PHYS 114 taught by Professor Shoberg during the Spring '07 term at Pittsburg State Uiversity.
 Spring '07
 Shoberg
 Current, Resistance, Power, Work

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