| Word | What it means |
| power house | the place where electrical energy is produced |
| transmission line | the line that carries electrical energy over long distances |
| transformer | the machine that raises or lowers voltage |
| wiring | joining wires and devices together so a circuit works |
| master switch | another name for the main switch |
| unit | one kilowatt hour of electrical energy |
| MCB | the safety device that trips off when the current is too large |
| short circuit | a fault in which a very large current flows all at once |
| LED, light emitting diode | a modern bulb that lights on very little electricity |
| fluorescent bulb | an electrical bulb shaped like a tube |