Resistive Circuit Elements
Learning objectives of this lecture
z
Explain voltage and current sources,
resistors and conductors
z
Solve for currents, voltages and powers
in simple resistive circuits
z
Determine equivalent resistance
KCL and KVL
∑
=
=
N
n
n
i
1
0
∑
=
=
N
n
n
v
1
0
Resistive Circuit Elements
– Conductor
– Voltage source
– Current source
–Res
is
tor
Conductor
z
Symbol
z
The voltage between
the two ends of an
ideal conductor is
always zero
irrespective of the
current flowing
through it.
i
v
0
Voltage Source
z
Symbol
z
An ideal voltage source provides a
prescribed voltage across its terminals
irrespective of the current flowing through
it.
+
_
v
s
V
s
v
0
v
s
−
i
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Current Source
z
Symbol
z
An ideal current source provides a
prescribed current to any circuit connected
to it.
i
s
v
0
i
s
i
Resistor
z
Symbol
z
The voltage
v
across an resistor
R
is
proportional to the current
i
through the
resistor
z
Unit: 1 ohm = 1volt/ampere or 1
Ω
= 1 V/A
R
+
−
v
i
v
0
R
i
Ohm’s Law
z
v=iR
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 Three '09
 ZhengLi
 Resistor, Electrical resistance, Series and parallel circuits, r3 r1 r2, R3 R2 R1, rn rn

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