The unit of electric potential is called a volt, which measures the potential difference between two points in an electric field. It indicates how much work is needed to move charge.

The magnitude of electrical resistance remains constant with changes in voltage, as long as the temperature stays the same.

However, resistance generally increases with an increase in temperature.

In electrical circuits, when the voltage is low, it typically results in higher resistance and consequently lower current flow, according to Ohm's Law (V = IR).

Electromotive force (EMF) refers to the energy used to drive electric charge through a circuit, measured in volts.

It indicates the energy per unit charge supplied by a source like a battery.

The siemen (S) is the unit of electrical conductance, which is the reciprocal of resistance measured in ohms.