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AS Electricity
Electricity Baby
| Question | Answer |
|---|---|
| Plank's Constant | E=hc/λ |
| Equation for PD, Amperes pand Resistance | V = IR |
| potential divider equation | V1/V2=R1/R2 as R2 increased, the value of V2 increased and value of V1 decreases. |
| (V-out) Output potential equation (potential divider) | V(out)=(R2/(R1+R2))xV(in) |
| Electron charge | 1.6*10^-19 |
| Charge equation | Charge (coulumbs) = Current (amperes) x Time (seconds) |
| Number of electrons equation | Number of electrons = Charge/ charge electron Reason behind this is due to the being coulumbs is a greater value off the coulumb charge fo the electrons, the number of electrons must total the amount of electron charge to equal the total charge |
| Cross-sectional Area Equation? | πr^2 |
| Drift Velocity equation? | V = I/Ane Velocity= Current/( Cross-sectional Area x Number Density x Electron Charge) |
| Resistance of wire (in regards to resistivity) | R= pL/A Resistance(ohms) = Resistivity (ohms meter) x length (m) / Cross sectional area (meters squared) |
| Potential difference equation | V= IR Potential Differrence = Current x Resistance |
| Amps fundamental definition? | I=Q/T How much charge flows per second |
| is resistance a constant value? | Theoretically yes, as resistance should be constant if the temperature is constant however some things dont follow that rule. |
| internal resistance? | resistance from cell, kerschoffs 2nd law : E= VR + Vr where VR is terminal potential and Vr is loss volts. Vr increases and VR decreases when current increases. |
| Power dissipated | P=I^2*R= V^2/R = I^2*R |
Created by:
thomjj
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