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Electricity
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
Electric Current• Measured in Amperes• 1 Ampere = 6,250 million electrons
flowing past a point every second
Voltage Difference• Electric Charge flows from higher
voltage to lower voltage• Measured in Volts
Resistance• The tendency for a material to
oppose the flow of electrons• Changes electrical energy into
thermal energy or light• Measured in Ohms (Ω)
Ohm’s LawI Current (amperes)V Voltage Difference (volts)R Resistance (ohms)
(89-90)