Question

a tesla car needs to charge its 350-volt model and must send about 715 amps through its cabling to the battery. how many electrons pass through the cable for the current involved.

Answer 1

Current is defined as $I=\dfrac{\Delta Q}{\Delta t}$

So we can find the total charge: 

$\Delta Q= Current\times time\ period$

Lets say car is charged for 1 minutes

So, Total charge transferred in 1 minutes= $715\times 60 =42900\ C$

and number of electrons pass through wire in one minutes=$\dfrac{42900\ C}{1.6\times 10^{-19}\frac{C}{electrons}}=2.68\times 10^{23}\ \ electrons$