Ohm's law
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.