Fuses, Earthing and Circuit Breakers
 

Fuses, Earthing and Circuit Breakers problem 15


A teacher uses a power supply in a metal case. The circuit for the power supply includes a fuse. The metal case of the power supply is earthed. A fault occurs and a live wire touches the metal case. Explain how earthing the metal case protects the teacher.


 

main author and content editor: Adebola Oluwadare