<Dd> I = Q t, (\ displaystyle I = (Q \ over t) \,,) </Dd> <P> where Q is the electric charge transferred through the surface over a time t . If Q and t are measured in coulombs and seconds respectively, I is in amperes . </P> <P> More generally, electric current can be represented as the rate at which charge flows through a given surface as: </P> <Dl> <Dd> I = d Q d t . (\ displaystyle I = (\ frac (\ mathrm (d) Q) (\ mathrm (d) t)) \, .) </Dd> </Dl>

Direction of current and electron flow in a circuit