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16 Cards in this Set
- Front
- Back
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Ohm's Law |
V=IR R= resistance in ohms I R |
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Resistance |
R=p.(L/A) R=resistance in ohms p= resistivity value (ohms.m) L= length (m) A= cross-sectional area (m2) |
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Voltage-Current-Resistance Relationship |
2 variables for Current: Inversely proportional to resistance Directly proportional to electric potential difference (delta V) |
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Conductor
Insulator |
Conductor - allows electric charge to flow through it
Insulator - material in which e-'s are tightly bound |
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E = elemental electric charge |
E= 1.6*10^-19 coulombs |
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Coulomb
Ampere
Volt |
Coulomb = 1ampere*1 second
Ampere = 1 coulomb/second = 6.25*10^18 electrons/second
Volt = 1 Joule/1 Coulomb |
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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) |
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Voltage Series and parallel Units |
Series: Vtotal = V1 + V2 + V3....
Parallel: Vtotal = V1 = V2 = V3....
Units: Volts
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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.
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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 |
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Capacitors in series and parallel |
Series: 1/Ctotal = 1/C1 + 1/C2 +1/C3...
Parallel: Ctotal = C1+ C2 +C3..... |
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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 |
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Current in series and parallel |
Series: I1 = I2 = I3.....
Parallel: Itotal= I1 + I2 + I3.....
UNITS: ampere (A) |
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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) |
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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
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