Electrical Generator III

Basic principles of backup electrical generators, industrial power generator, diesel electrical generators & electricity.

 The basic principles of Backup Generators and electricity, An electrical current is the flow of electricity around an electrical circuit. The flow of electricity follows similar principles to the flow of water in pipes, as we shall see, with the exception that an electrical system must make a complete circuit.

The circuit will contain a power source of some kind; in mains wiring the power source is the national electrical distribution system which is mostly outside our control.

Of course, the distribution company don't run wires directly from the power station to our houses: there is all manner of other stuff between them and us, but that isn't all that important. For most cases you can proceed as if a small power station was connected directly to your house.

Diesel Generator

In domestic electrical work, current is generally measured in amps. Currents you will encounter in practice range from about 0.5 amps (through a lightbulb) to about 40 amps (an electric shower). Technically `amps' is short for `Ampиres', but the full name is now rarely used. The mathematical symbol for current, as it is written in calculations, is not `C' (for current) or `A' (for amps) but in fact `I'. This is just because the symbols `C' and `A' are reserved for other things. You will occasionally come across currents measured in milliamps (`mA' for short). A milliamp is a thousandth of an amp. For example, most earth-leakage breakers used in domestic wiring trip at 30 mA, which is about one thirtieth of an amp.

To get an electrical current to flow, we need a power source, and some sort of conductor. A conductor is defined as anything that can carry a flow of electricity. In electrical practice, conductors tend to be copper wire or copper bars, usually hidden away inside plastic sleeves. The sleeves are insulators, that is, materials that prevent the flow of electricity. It is the insulator that keeps the electrical current where it belongs - inside the cable.

You can be an electrician without knowing much about electricity. It seems odd, but it's true. But if you do know the principles, you can do safe and practical work without memorizing a whole heap of regulations, because they're mostly derived from standard principles anyway. The key features of electricity are voltage, current, resistance, power, and frequency.