# Shared Flashcard Set

## Details

Ch 26-30
Capacitors, Current and Resistance, Current Density, Resistivity, Circuits, Magnetic Fields
15
Physics
04/06/2011

Term
 Capaitance
Definition
 The amount of charge needed for there to be 1 V potential difference betweent he plates.   an object has an amount of capacitance (in Farads) independent of type of circuit.   Depends only on physical properties (geometry, size)   = Charge/ Voltage
Term
 Capacitors (in parellel)
Definition
 ADD!     C1+C2+C3 = Ceq   - Have equal voltage!
Term
 Charge Density
Definition
 sigma = Q/A
Term
 Capacitors (in series)
Definition
 Ceq =   _1_ 1+ 1 c1 c2   - Have equal Charge!
Term
 Electron Velocity
Definition
 10^6 m/s
Term
 Drift Velocity
Definition
 10^-4 m/s
Term
 Current Velocity
Definition
 3*10^8 m/s
Term
 Resistance
Definition
 The amount of voltage it takes to drive 1 AMP of current across a Potential Difference of 1V (Ohms)   the higher the potential difference across the resistor, the large the current through it.
Term
 Ohm's Law
Definition
 V= IR   Power = VI, I^2R, v^2/R   Energy = P*time
Term
 Volt
Definition
 1 J/C
Term
 Amp
Definition
 1C/sec
Term
 Current Density (J)
Definition
 J = I/A (Coulombs* s-1/ m^2)
Term
 Resistance (using Resistivity)
Definition
 R = row * (L/A)
Term
 Resistors (in series)
Definition