Introduction to Electronics
From CCRMA Wiki
Current, Voltage, Resistance
Current describes the quantity of electrons passing through a point in a circuit at a given instant in time. Current is measured in Amperes (Amps, A).
Voltage describes the potential difference in electrical charge between two points in an electrical circuit. Voltage (also known as Electro motive force or EMF) is measures in Volts.
Resistance (a special case of Impedance) describes the capacity of a circuit element to resist or impede the flow of electrons in the circuit. Resistance in measure in Ohms.