Electron Drift Velocity

Factors affecting current
1. Thicker wire - lower resistance
2. Cool wires down - + ions wont move as fast to create obstacles for electrons
3. More batteries - more current, giving energy to electrons in wires
4. Materials with more charge carriers
5. No. of charged particles
6. Speed at which particles move
I = n A V e
1. n = no. of charged particles
2. A = area of wire
3. V = velocity of electrons
4. e = charge of electrons
Conductors
1. Electrons free to move
2. No. of available electrons depends on conductor
3. No. of density electrons
4. Good conductors - most charge carriers
Semi-conductors
1. Require energy to free electrons
2. Lower density
3. Electrons travel faster than in conductors due to low density
4. Density increased by doping semi-conductor with impurities
Insulators
1. Electron density is 0
2. Low voltages
3. No free electrons
4. Current unable to flow

Resource summary

	Created by EmmyBen about 10 years ago