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16 Cards in this Set
 Front
 Back
Ohm's Law 
V=IR R= resistance in ohms I R 

Resistance 
R=p.(L/A) R=resistance in ohms p= resistivity value (ohms.m) L= length (m) A= crosssectional area (m2) 

VoltageCurrentResistance Relationship 
2 variables for Current: Inversely proportional to resistance Directly proportional to electric potential difference (delta V) 

Conductor
Insulator 
Conductor  allows electric charge to flow through it
Insulator  material in which e's are tightly bound 

E = elemental electric charge 
E= 1.6*10^19 coulombs 

Coulomb
Ampere
Volt 
Coulomb = 1ampere*1 second
Ampere = 1 coulomb/second = 6.25*10^18 electrons/second
Volt = 1 Joule/1 Coulomb 

Current Definition Equation 
Rate at which charge flows past a point on the circuit
I=Q/t I= current (ampere,A) Q= 1.6*10^19 C (charge on 1 electron) t= time (seconds) 

Voltage Series and parallel Units 
Series: Vtotal = V1 + V2 + V3....
Parallel: Vtotal = V1 = V2 = V3....
Units: Volts


Coulomb's Law of Electrostatic force 
FE = K(q1q2/r^2) FE = electrostatic force K= 9*10^9 N.m^2/C^2 (coulomb's constant) q1 & q2 = charges r = distance between two charges
When q1 &q2 are both POSITIVE or both NEGATIVE so is FE. When they are neutral, FE=0. Halving distance quadruples the force. Doubling it quarters the force.


Capacitors Capacitance Equation and units 
Capacitors  store charge Capacitance  measure of stored charge
C=Q/V Q= charge stored on one side of a capacitor V= voltage across capacitor C= capacitance (Farad) Farad= coulombs/volts 

Capacitors in series and parallel 
Series: 1/Ctotal = 1/C1 + 1/C2 +1/C3...
Parallel: Ctotal = C1+ C2 +C3..... 

Resistance in series and parallel 
Series: Rtotal = R1+ R2 + R3....
Parallel: 1/Rtotal = 1/R1 + 1/R2 +1/R3....
In parallel total resistance goes down UNITS = ohms 

Current in series and parallel 
Series: I1 = I2 = I3.....
Parallel: Itotal= I1 + I2 + I3.....
UNITS: ampere (A) 

Power (electricity Definition Units Equation 
Definition: rate at which energy is supplied or converted by the appliance or circuit P= delta E/t P= delta V (Q/t) = delta V*I = delta V^2/R delta V= voltage in volts I= current in amps R= resistance in Ohms Q = charge in coulombs t= time in seconds P= power in watts UNITS: watts (W) 




Uniform magnetic field
Thumb=V, fingers=B, palm=F Positive= use right hand Negative=use left hand No force when V is not perpendicular to B (velocity is in the same plane) 
F=qVB F=qVBsintheta q= magnitude of the charge (coulombs) v= velocity of the charge (m/s) B= magnetic field vector (Teslas)
Tesla= 1N/Coulomb.m/sec
