# Electrictiy

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1. SI unit for Current
Ampere (A); 1 ampere=1 coulomb per sec=1 c/s
2. Current Density
(J)=I/A=nllvd=(A/m2)
3. Conductivity (rho)
rho=nll2r/m
4. Electron current
ie=Ne/(delta) t where Ne=#electons
5. Electron Current in Wire
ie=neAvd with SI unit s-1
6. Electron Drift Speed
vd= (e (gamma) /m) E
7. Energy Density

units (J/m3)
8. Dielectric- insulator inside a capacitor
Kappa==(Epsilon not)/E
9. Potential Difference w/in Dielectric
(delta) Vc=((delta) Vc)0/Kappa
10. Capacitance
C=Q/(delta) Vc = (epsilon not x A) / d
11. Charge on Capacitor
Q=C delta Vo
12. Parallel Capacitor
• Ceq=C1+C2+C3=...
• Greate than single
13. Series Capacitor
• Ceq=(1/C1+1/C2+1/C3+...)-1
• Less than single
14. Energy stored in capacitor
Uc=Q2/2C = 1/2 C(deltaVc)2 = epsilon not/2 (Ad) E2
15. Capacitance
16. Potential Difference
delta V = Vf-Vi= - (from i to f) E X ds
17. Potential (electric field comp in s dir)
Es=- dV/ds
18. Kirchhoff's Loop-sum of all potential differences in a loop/closed path
delta Vloop=sigma ( delta V)= 0
19. Capacitance
C= Q/detla Vc=Epsilon not x A / d