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# ch. 34 vocab

### physics ch. 34 vocab

potential difference the difference in electric potential between two points free charge flows when there is a difference and will continue until both points reach a common potential
electric current the flow of electric charge measured in amperes
ampere SI unit of electric current. a flow of one coulumb of charge per second is one ampere. symbol A
voltage source a device such as a battery or generator , that provides a potential difference
electric resistance the resistance of a material to the flow of electric current through it is measured in ohms
superconductivity- a property of a material that has infinite conductivity at very low temperatures , so that charge flows through it without resistance
ohm the SI unit of electric resistance . one ohm is the resistance of a device that draws a current of one ampere when a volt is impressed across it
ohm's law the statement that the current in a circuit is direclty portional to the voltage impressed across the circuit , is inversely proptional to the resistance of the circuit
direct curent (DC) electric current whose flow of charge is always in one direction
alternating current (AC) electric current that repeatedly reverses direction twice each cycle . usually at 60 cycles per second of hertz
electric power the rate at which electrical enegery is converted into another form such as light, heat, or mechanical energy
Created by: hkramer