When it comes to electrical circuits, there’s a lot to remember and understand. We've got you covered with this Intro to Circuits BBC Bitesize guide.

There are standard designations and symbols that describe how electrical contacts work in specific scenarios.

Many of the basic electrical systems concepts can be applied to a device such as this. Before delving into the specifics of a defibrillator’s electrical circuit, a few key laws, formulas, and ...