engineering
why is copper a good conductor?
some electrons in metallic materials arent tightly bonded to the nucleus so little effort is needed to persuade the electrons to move.
why is no material a perfect insulator?
they have no loosely bound electrons so movement of electrons from atoms is very difficuly. all materials will allow some electron movement if the force is large enough.
electron repulsion
two groups of electrons are brought together, a force exists to attempt to seperate the two groups
what is the unit of charge?
coulomb (C)
what is the coulomb?
quantity of charge which passes a section of a conductor in 1s
what is potential?
indicates the amount that a body is electrically charged.
what is electrical potential?
work per unit of charge
what is the unit of potential
volt= joule per coulomb
what is potential difference?
The difference of potential energy from one point to another ( A to B )
what is the unit of electromotive force?
volt.
what is electromotive force?
the electrical force that gives this increase in potential difference at the source.
what is the electric circuit?
the conduction of electricity in metal is due to the drift of free electrons from a lower potential to a higher potential.