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velocity
 - distance travelled divided by time of travel
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Fundamental SI units
- Length Mass Time
- meter (m) kilogram (kg) second (s)
Electric Current: ampere (A)
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Electric Charge
measured in coulombs, C
1C = 1 A⋅s
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Kinetic Energy (KE)
energy of motion
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Potential Energy (PE)
stored energy that can be converted to kinetic energy
ΔPEgrav=ΔKE
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Electric Potential
or
Potential
- measured in volts, V
- 1V = 1 J/C
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Potential Difference
Voltage
difference in potential between 2 points
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Current (I)
flow of charge
measured in ampere, A
1A = 1 C/s
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Circuit
closed loop that current can flow around
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Ohm's Law
current is proprtional to voltage
V = IR
V=Voltage, I=current, R=resistance
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Resistance (R)
Measured in ohm, Ω
1Ω = 1 V/A
smaller the resistance, more easily current flows
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Resistivity (R)
measured in Ω⋅m
changes with temperature
-
- p(T) = resistivity at temperature T
- p0 = resistivity at some reference temperature, T0 (usually 20 °C)
- α is the temperature coefficient of resistivity, usually has units of (°C)-1
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Power
the rate at which energy is transferred
1W = 1 J/s
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Power (P)
P = IV
P = I 2R
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