1. Electricity

2. Electric Current The net movement of electric charges in a single direction Electrons in a material (metal wire) are in constant motion in all directions = No Net Movement of electrons in one direction In an electric current the electrons drift in the direction of the flow

3. Electric Current Measured in Amperes 1 Ampere = 6,250 million electrons flowing past a point every second

4. Voltage Difference Electric Charge flows from higher voltage to lower voltage Measured in Volts

5. Resistance The tendency for a material to oppose the flow of electrons Changes electrical energy into thermal energy or light Measured in Ohms (Ω)

6. Ohm’s Law I  Current (amperes) V  Voltage Difference (volts) R  Resistance (ohms) (89-90)