509387
Electron Drift Velocity
- Factors affecting
current
- Thicker wire - lower
resistance
- Cool wires down - + ions
wont move as fast to
create obstacles for
electrons
- More batteries - more
current, giving energy to
electrons in wires
- Materials with more
charge carriers
- No. of charged particles
- Speed at which
particles move
- Thicker wire - lower
resistance
- I = n A V e
- n = no. of
charged particles
- A = area of wire
- V = velocity of
electrons
- e = charge of
electrons
- n = no. of
charged particles
- Conductors
- Electrons free
to move
- No. of available
electrons depends
on conductor
- No. of density
electrons
- Good conductors -
most charge carriers
- Electrons free
to move
- Semi-conductors
- Require energy to
free electrons
- Lower density
- Electrons travel faster
than in conductors due to
low density
- Density increased by
doping semi-conductor
with impurities
- Require energy to
free electrons
- Insulators
- Electron density is 0
- Low voltages
- No free electrons
- Current unable to flow
- Electron density is 0
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