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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Introduction to Electric Circuits
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
+

V
V
+

80
I
V80
30V
V300
300
120
V120
A
A
80
I
V80
30V
V300
300
A
120
V120
Ω
Ω
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