Awire delivers 12.0 c of charge in 4.0 s. what is the current in the wire

So we want to know what is the current in the wire if the wire delivers 12 c of charge in 4 s. by definition, i=q/t, where i is the current, q is the amount change that is going trough the wire  and t is the time. so now we simply plug in the numbers: i=12/4=3 a. so the current flowing in the wire is equal to 4 a. 

Answerthe energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.explanationwe define electric potential as the ratio electric potential energy to the charge,    then the following gives us the potential difference,      the formula  may be on your formula sheet.the change in electric potential energy would be the energy that would needed to move it from point a to point b. solving for that, we get    using q = 8.00  × 10⁻¹⁹ c and  δv = 2.00 v, we get    the energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.