Here is how you can offer your support to all the work of the electric academy:
The Electric Academy Patreon Page
For as little as $1 a month you can help keep all the resources free and awesome.

For access to the free online courses:
The Electric Academy free courses

Here are the links to the textbooks I wrote this past year:
Single-phase transformers
Basic Electricity
Trigonometry and AC generation

For more open educational resources check out Skills commons and BCcampus.

If you haven't subscribed yet make sure you do yourself a favour and head on over to the YouTube channel and hit that subscribe button.