Introduction to Electric Circuits. Dr. William A. Stapleton Ingram School Of Engineering Texas State University – San Marcos. Electrical Circuits (Over)simplified.
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Dr. William A. Stapleton
Ingram School Of Engineering
Texas State University – San Marcos
dc Voltage Source
Energy per electron is increased by a fixed amount as current passes from the “” to “+” end.
Current may flow either direction (source or sink)
dc Current Source
Current magnitude leaving source is fixed. Voltage across source is adjusted to allow this to happen.
IR
+
In general V=IZ
For a resistor Z=R
So VR=IRR
R
VR

All resistor values are in units of ohms (Ω)
R1
R2
R3
I
12V
120
IS
IR
+
+
R
VR
VS
Sink
Expends energy
Source
Supplies energy


0.1A
12V
120
80
I
30V
300
120
80
I
V80
30V
V300
300
120
V120
IS
I80
I120
I300
120V
80Ω
120Ω
300Ω
V300
V120
V80
IS
I1
I2
I3
120V
80Ω
120Ω
300Ω
V300
V120
V80
+

V
Voltmeter+

Using a Voltmeter80
I
V80
30V
V300
300
120
V120
A
Ammeter80
I
V80
30V
V300
300
A
120
V120
IS
R1
R2
VS
R3
R5
R4
IS
R1
R2
VS
R3
R5
R4
IS
VS
R1
R2
R3
R4
R5
IS
VS
R1
R2
R3
R4
R5
IS
R1
R2
R3
VS
R4
R5
A
RA
A
RC
RB
R1
R2
C
B
C
R3
B