A current of 1A flows in a wire carried by electrons. How many electrons pass through the a cross-section of the wire each second?
I solved my own Question

$$Q=It$$

Since I=1A and we are interested when t=1 second. Therefore:

$$Q=1\cdot 1=1C$$

We know that the charge of 1 electron has the magnitude 1.6 x 10^(-19) C. Therefore we are looking for the solution to this equation:

$$\text{# Number of electrons x }1.6 \text{ x }10^{-19}=1C$$

$$\implies \text{Number of electrons}=6.25 \text{ x } 10^{18}$$