Below is a circuit diagram for a greenhouse fan. When the greenhouse becomes too hot (above 27 degrees Celsius), a motor fan will switch on to cool the greenhouse down. Figure caption, ...

The best way to avoid electrocution in the garage is to link your power tools to a circuit breaker. To help you choose the best circuit breaker, we review eight so you don’t have to.

The circuit diagram shows a circuit with two lamps connected in parallel. If one lamp breaks, the other lamp will still light. The lights in most houses are connected in parallel.