Voltage

Voltage is how we measure the difference in electric potential energy (∆PE). The two main ideas we covered are electric potential and potential difference.  Electric potential tells us how much work is necessary per unit of charge. Potential difference tells us how much total work is needed to move one charge to another point. The equation used for Voltage is V= ∆PE/q (q= one coulomb of charge). Example problem: If we were to move a charge from point A to point B and we put a number of joules of work in to the charge then we will recover the exact same number of joules in the charge if we move it back from point B to A. The joules of work are neither created nor destroyed, therefore the potential difference remains the same.