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Electric_Circuits
Course: PHYS 4C, Spring 2012School: Cabrillo College
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Circuits Current: Current: Electric I = q t Current flows because a potential difference across a conductor creates an electric field which exerts a force on free electrons in the circuit. Conventional current: the hypothetical flow of positive charge (it is really electrons flowing in opposite direction) Electromotive force or emf: the maximum difference in electrical potential between the terminals of a...
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Circuits
Current:
Current: Electric I =
q
t
Current flows because a potential difference across a conductor creates an electric
field which exerts a force on free electrons in the circuit.
Conventional current: the hypothetical flow of positive charge (it is really electrons
flowing in opposite direction)
Electromotive force or emf: the maximum difference in electrical potential between the
terminals of a battery
Ohms Law:
Ohms law: R =
V
= constant
I
Ohms law is more commonly stated as: V = IR or I =
V
R
Resistance Resistivity:
Resistance and of a wire is given by: R =
L
A
Resistivity depends upon temperature: = 0 [1 + (T T0 )]
Power:
Power:
P = IV
P = I 2R =
applies to any circuit element
2
V
R
applies only to resistors
Resistors in series:
Resistors in parallel:
Current is the same through each resistor
Voltage is the same across each resistor
Voltage is split among individual resistors
Current is split among the individual resistors
Req = R1 + R2 + R3 + ...
1
1
1
1
=
+
+
+ ...
Req R1 R2 R3
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