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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
2013-07-22T17:36:19Z
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