Circuit breakers are a safety feature that automatically interrupts the flow of electricity in the face of a system fault or ...

Numerous examples are given to illustrate the principles of direct current and alternating current machinery and in addition there is a selection of problems, at the end of most chapters, which ...

Mains electricity and alternating current - Edexcel Electricity can flow either as direct or alternating current, and is used in homes to power electrical appliances.