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Physics Quicksheets - DC and AC Circuits
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Direct Current
Current:
Current:
the flow of electric charge. Current is given by:
SI units: Amp (A) = C/s
*The direction of current is the direction positive charge would flow, or from high to low potential.
Ohm's Law and Resistance
V = IR
*can be applied to entire circuit or individual resistors.
Circuits - Resistance
Opposition to the flow of charge.
*Resistance increases with increasing temperatures with most conductors)
SI units: Ohm (Ω) =
Circuit Laws
Kirchoff's Laws:
1. At any junction within a circuit, the sum of current flowing into that point must equal the current leaving.
2. The sum of voltage sources equals the sum of voltage drops around a closed circuit loop.
Alternating Current:
Series Circuits
I = Constant
R
eff
= R
1
+ R
2
+ R
3
+...
V
eff
= V
1
+ V
2
+ V
3
+ ...
Parallel Circuits:
V = Constant
I
eff
= I
1
+ I
2
+ I
3
+ ...
Power Dissipated by Resistors
SI units: Watt (W) = J/s
Capacitance
the ability to store charge per unit voltage.
It is given by:
or
ε
0
= 8.85 x 10
-12
C
2
/N*m
2
SI units: Farad (F) =
Capacitors in Parallel:
Capacitors in Series:
Energy Stored by Capacitors
Battery Internal Resistance (r): PG 226
Dielectrics
nonconducting material that increases capacitance.
C
new
= kC
old
K = constant dependent on material
Author
awc1990
ID
227425
Card Set
Physics Quicksheets - DC and AC Circuits
Description
Kaplan Quicksheets Chapter 8
Updated
7/22/2013, 5:36:19 PM
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