a)
In the circuit below, resistor R is increased. What happens to the following quantities?
(Circle the appropriate answer.)
V
R1
R
R2
R3
x
Power dissipated in R1
increases
decreases
stays the same
x
Power dissipated in R2
increases
decreases
stays the same
x
Power supplied by voltage source
increases
decreases
stays the same
x
Voltage across R3
increases
decreases
stays the same
b)
Find the power associated with each element in the circuit below. State whether each
source is supplying or absorbing power.
10V
5A
2I
1
5V
1
10A
I
1

V
1
+
Element
Voltage
Current
Power
Absorbed or
delivered
5A source
60V
5A
VI=300W
300W del.
Dependent
source 5V
1
50V
5A
VI=250W
250W del.
Dependent
source 2i
1
10V
10A
VI=100W
100W abs.
10V source
10V
5A
VI=50W
50W del.
10A source
50V
10A
VI=500W
500W abs.
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c)
For the circuit below, V
A
and V
B
are defined relative to the reference node as shown.
Find the requested quantities.
Switches A and B
are open
V
A
= ______5V
_____
V
B
= ____5V_
______
Power dissipated
in R
1
=__0W_
____
Switch A is closed,
B is open
V
A
= _____0V__
____
V
B
= ____0V__
_____
Power dissipated
in R
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 Fall '06
 MCCANN
 Power, Volt, Resistor, node voltage equation

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