Question

A charge of `2 C` is passing through points A and B on a circuit. If the charge's electric potential changes from `12 J` to `7 J`, what is the voltage between points A and B?

Answer 1

I found `2.5` volts but check my method!

Explanation:

Voltage is energy/charge or `"joule"/"coulomb"` (basically equat to the energy carried by each charge of one coulomb).
In our case we have:
`V_1=12/2=6` volts
`V_2=7/2` volts
The potential difference should be:
`V_1-V_2=6-7/2=(12-7)/2=5/2=2.5` volts