Different models, such as water flowing in a central heating system, can be used to understand electrical circuits. Find out more with BBC Bitesize. For students between the ages of 11 and 14.

The film explains the measurement of electric current using ammeters, which quantify the flow of elementary charges in a circuit. It introduces the concept of amperes as a measure of the number of ...

GM accomplishes this by wiring the No. 2 (field) wire into either an indicator lamp (see Diagram A) or, on some gauge-equipped cars, into the ammeter. You can duplicate the "stock" wiring by ...