## Important Concepts

- The amount of work electricity can do is described in terms of
*amperage*and*voltage*. *Amperage*(`A`

) describes the quantity of charge carriers flowing in an electric current.*Current*is a colloquial term that means amperage.*Amp hours*(`Ah`

) describe the quantity of available charge or charge used.*Voltage*(`V`

) describes the quantity of electromagnetic force in which charge carriers are being pushed in an electric current.- Voltage is always a relative measurement between two points.
*Wattage*(`W`

) is a convenience unit to describe electricity that includes amps and voltage, multiplied together (`watts = amps x volts`

).- Volts and amps can be traded for each other in a current, as long as the overall amount of work (Wattage), stays the same. This is often done through induction.
*Power*is a colloquial term that usually means wattage.- Circuits are closed loops that consists of a voltage
*source*, a*load*, and a return path called*ground*or*common*.

## Part 3 - Current Types; AC & DC