Power Supplies
| Component | Circuit Symbol | Function of Component |
| Cell |  | Supplies electrical energy. A single cell is often wrongly called a battery, but strictly a battery is two or more cells joined together. |
| Battery |  | Supplies electrical energy. A battery is more than one cell. |
| DC supply |  | Supplies electrical energy. DC = Direct Current, always flowing in one direction. |
| AC supply |  | Supplies electrical energy. AC = Alternating Current, continually changing direction. |
| Fuse |  | A safety device which will 'blow' (melt) if the current flowing through it exceeds a specified value. |
| Transformer |  | Two coils of wire linked by an iron core. Transformers are used to step up (increase) and step down (decrease) AC voltages. Energy is transferred between the coils by the magnetic field in the core. There is no electrical connection between the coils. |
| Earth (Ground) |  | A connection to earth. For many electronic circuits this is the 0V (zero volts) of the power supply, but for mains electricity and some radio circuits it really means the earth. It is also known as ground. |
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