c20 c21 electrical circuits and the heating effect of electric current

potential difference

the work done in in bring a charge of 1 coulomb between 2 points in an electric field

one volt

the potential difference when 1 joule of work i done to move 1c of charge between 2 points

electromotive force

the difference in potential between 2 points of the battery or power source that creates the current

current

the amount of charge passing any point on a conductor per second

direct curent

current flowing in 1 direction

alternating current

current reversing direction many times a second at regular intervals

resistance

the opposition of current in a circuit

ohms law

states that the current flowing through a conductor is proportional to the potential difference applied across its ends provided temperature and other physical conditions remain constant

resistivity

how much a material resists electric current

joules law

states heat produced in a conductor is directly proportional to square of current resistance and time for which current flows

bonding

providing (conducting) path between 2 objects i.e joining objects