Unit of electric current, defined by the force between two parallel conductors carrying a constant current. Specifically, 1 ampere is the current that produces a force of 2 * 10^-7 newtons per meter between two wires one meter apart in a vacuum.

Unit of electric charge, defined by the current of 1 ampere flowing for one second. 1 ampere = 1 coulomb/second.

The charge of an electron is -1.602176565 * 10^-19 coulombs.

1. coulomb = 6.241509343*10^18 electrons.
2. Electrons in 1 ampere: A current of 1 ampere corresponds to 6.241509343*10^18 electrons per second.

The unit of power, where 1 watt = 1 joule/second.

The unit of electric potential difference, defined as the potential difference across a wire carrying 1 ampere when the power dissipated is 1 watt.

1 volt = 1 watt/ampered or equivalently 1 volt = 1 joule/coulomb.

The unit of electrical resistance, defined as the resistance between two points when 1 volt is applied and 1 ampere of current flows.

1 ohm = 1 volt/ampered.