potential difference वाक्य

The heat transfer is found by using the appropriate potential difference and electrical circuits.
The relationship between capacitance, charge and potential difference is linear.
Nowadays, this is often known as a contact potential difference.
Potential differences among lawmakers on Medicare overhaul also are surfacing within the Republican Party.
I am slightly confused what is the difference between electromotive force and potential difference.

This temperature difference generates a potential difference between the electrodes.
It is this potential difference which is measured and converted to a pH value.
The amplifiers or repeaters derive their power from the potential difference drop across them.
They acted more as lenses framing the potential difference the parties would have overseas.
To me that's harder than figuring out that current * potential difference = power.