It’s the beginning of another school year, and another crop of year 9/10 students is about to not get the hang of what electricity is all about, writes Bernie Hobbs.
The right way: “Maxwell-lite: fields, current and energy for beginners” The main points are:
- Separating positive and negative charges creates an electric field with stored energy.
- Whenever charges are moving in an organised way (like electrons in an AC or DC current), they create a magnetic field.
- If you’ve got an electric field and a magnetic field together you’ve got yourself an electromagnetic field — and energy will flow through that field.