Delmar's Electricity Unit 2, Electrical Quantities and Ohms Law

R = E / I 

The charge transferred by a current of 1 ampere in one second.

The ampere is a measurement of the amount of electricity that is flowing through a circuit.  One  ampere of current flows through a wire when 1 couloumb flows past a point in one second.

Voltage is defined as the potential difference between two points of a conducting wire carring a constant current of 1 ampere where the power dissipated between these points is 1 watt.  It is the force that pushes the electrons through a wire and is often referred to as electrical pressure.

An Ohm is the unit of ressistance to current flow.  It is the amount of ressistance that allows 1 amphere of current to flow when the applied voltage is 1 volt.