When you need a multimeter for testing electrical equipment around the home, it's vital to know what all those symbols around the dial mean.

There are standard designations and symbols that describe how electrical contacts work in specific scenarios. These designations spell out the number of contacts and how they behave during operation.

For electricity to flow, everything needs to be connected in a big ring. It’s called a circuit. For example, the lights in most houses and flats are part of a circuit controlled by the consumer unit, ...