An explanation of the basics of mains domestic electricity suitable for GCSE that is 13 to 16 year old students.
The video tutorial is also for anyone needing an overview explanation of how the electricity supply to your house, factory or office works. The standards described here apply in the UK and also Ireland, Malaysia, Hong Kong, Malta, Singapore, Saudi Arabia and most of its neighbours, Cyprus and 40 others.
The video lesson includes the structure of wires and cables explaining how the use of earth, live and neutral wires works and keeps you safe. The function of a fuse melting when the circuit is overloaded is shown and explained. Also explained is the difference between an AC and DC supply and the function of a residual current circuit breaker.
Choosing the right fuse
In any complex or high voltage circuit a fuse is essential to protect the circuit and perhaps the user. In a standard domestic electricity supply there are likely to be many fuses including a main fuse to the building and separate fuses to protect individual appliances and users.
This video on Choosing a Fuse is in three parts explaining what a fuse does and how it works, a little about different fuses and then how to choose a fuse the right size.