Current, Voltage, and Resistance are related, which is called “Ohm’s law”. The unit of resistance (also named an "Ohm"), is defined so that “1 Ohm” as the resistance between two points in a conductor where the application of 1 volt will push 1 ampere, or 6.241×10^18 electrons, through. This takes energy, which (depending on the component which the charge is flowing through) is usually lost as heat. 