1. Voltage
The Volt symbol v
is the electrical pressure available to cause a
flow of current to a load when an electric circuit
is completed.

2. Current
•! The electrons flow from (-) to (+). ELECTRON FLOW
•! The flow of electrons is called CURRENT.
•! CONVENTIONAL CURRENT Flow is (+) to (-).
•! Conventional Current flow is the Australian Standard.
•! The unit of measurement is the ampere we use Amps
•! The symbol is A

3. Resistance
A circuit must have opposition to current flow.
High resistance means no current flow i.e open
circuit
Low resistance means high current flow i.e. short
circuit
Unit: OHM
Symbol: Ω