Question

The difference in potential between the cathode and anode of a spark plug is 14700 v. what energy does the electron give up as it passes between the electrodes? answer in units of j.

Answer 1

The energy the electron gives up passing between the electrodes is equal to the product between its charge and the potential difference between the electrodes:
$\Delta U = e \Delta V$
where 
e is the electron charge
$\Delta V$ is the potential difference

Plugging numbers into the equation, we find that the electron gives up is
$\Delta U = (1.6 \cdot 10^{-19} C)(14700 V)=2.35 \cdot 10^{-15} J$