physics definitions - current electricity

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electric charge

One coulomb is the amount of charge passing a cross-section of a conductor in one second, when the current is one ampere. 6,25 x 1018 electrons make up one coulomb.

electric current

the rate of flow of charge

potential difference

the work done per unit positive charge

power

the rate at which work is done

Ohms Law

current through a conductor is directly proportional to the potential difference across the conductor at constant temperature

resistance

a materials opposition to the flow of electric current

rheostat

a resistor in which you can change the resistance

an Ohm

a conductor has a resistance of 1 ohm if the current is one ampere when a potential difference of 1 volt is maintained between its ends