A wire carries a current of 2.0 A. What is the charge that has flowed through its cross–section in 1.0 s. How many electrons does this correspond to?

3.0 C, 1.25$\times$ 1019                            2.0 C, 1.25 $\times$  1019 4.0 C, 1.25 $\times$  1019    2.0 C, 5.25 $\times$  1019

2.0 C, 1.25 $\times$  1019

$ q = it = 2C$ $ n = \frac{Q}{e} = \frac{2}{1.6\times 10^{-19}} = 1.25 \times 10^{19}$