Glossary – some of the terms used

Glossary – some of the terms used

AC

Alternating current. This is where the current first flows one way, then the other (repeatedly). Mains electricity is alternating current.

Amps

The measurement used for current.

Capacitor

A charge storage device. It allows AC signals to pass through but it blocks DC signals.

Charge

The amount of electricity present or flowing. A charge can be positive or negative. There is an electric field in the vicinity of a charge. A charge can be stored in a capacitor or battery.

Current

The flow of charge through a system. Current has two forms, AC and DC.

DC

 This is where the current flows in the same direction at all times. It normally implies constant value as well as direction. Batteries produce direct current.

Energy

A measure of work done.

Ohms Law

The relationship between voltage, current and resistance. It only applies to resistive loads.

Power

The measure of work done in a period of time. If a battery contains a certain amount of energy it can power a device for a period of time. If the power requirement is less, the battery can power the piece of equipment for longer.

Resistance/impedance

The resistance to the current flow, an important concept in any electrical circuit.

Voltage

Electrical pressure. It can be likened to the amount of pressure water creates on the walls of a reservoir as the level rises.

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