Electric Current

Absolute 0 Temp
1. Above
  1. Atoms vibrate, liberated electrons
2. At 0
  1. Electrons attached to atoms
Direction of Flow
1. Coneventional
  1. The direction in which + charged particles would flow to the - terminal
2. Electron
  1. Electrons are - charged and would attract to the + terminal
Electrolyte
1. Solution containing - & + ions
Coulomb
1. The amount of charge that passes a point when a current of 1A flows for 1s
1.6 x 10^-19
Ammeter
1. In series
2. Measure Current
Kirchhoffs 1st Law
1. The sum of currents entering any junction in a circuit is equal to the sum of currents leaving that same junction
  1. This is a consequence of the conversation of charge
Flow of Charge
1. Net flow of electrically charged particles
2. Q= IT
3. Current at ALL points of circuit
Drift Velocity
1. The average velocity with which charge carriers move in the conventional direction. They are attracted to the opposite charge and collide along the way- hence drift
2. I=NAVE
  1. A= m^-3 m^2 ms^-1 C
3. V proportional to I
4. V proportional 1/A
5. V proportional 1/n
Number Density
1. Metals
  1. Heat up= Increases Resistance
  2. High no. density
2. Semi Conductors
  1. Heat up= Less resistance
  2. Electrons tightly bound
3. Insulators
  1. Low number density

Resource summary

	Created by amy.cottom2 over 11 years ago