
velocity
 distance travelled divided by time of travel

Fundamental SI units
 Length Mass Time
 meter (m) kilogram (kg) second (s)
Electric Current: ampere (A)

Electric Charge
measured in coulombs, C
1C = 1 A⋅s

Kinetic Energy (KE)
energy of motion

Potential Energy (PE)
stored energy that can be converted to kinetic energy
ΔPE_{grav}=ΔKE


Electric Potential
or
Potential
 measured in volts, V
 1V = 1 J/C

Potential Difference
Voltage
difference in potential between 2 points

Current (I)
flow of charge
measured in ampere, A
1A = 1 C/s

Circuit
closed loop that current can flow around

Ohm's Law
current is proprtional to voltage
V = IR
V=Voltage, I=current, R=resistance

Resistance (R)
Measured in ohm, Ω
1Ω = 1 V/A
smaller the resistance, more easily current flows

Resistivity (R)
measured in Ω⋅m
changes with temperature

 p(T) = resistivity at temperature T
 p_{0} = resistivity at some reference temperature, T_{0} (usually 20 °C)
 α is the temperature coefficient of resistivity, usually has units of (°C)^{1}

Power
the rate at which energy is transferred
1W = 1 J/s

Power (P)
P = IV
P = I ^{2}R

