CK-12 Foundation provides teachers and students with some excellent resources including Flexbooks, study guides, interactive math and science simulations, and even an online whiteboard platform.
This Wednesday CK-12 is hosting a free webinar about all of the open resources that they offer. In the webinar you will learn how to locate, save, and share resources in the CK-12 library. You will also learn how to assign work to students and track their progress through CK-12's LMS platform.
If you cannot attend the live webinar tomorrow, you can always visit CK-12's YouTube channel to learn more about the tools and open educational resources that they offer. Embedded below you will see CK-12's playlist of videos all about electricity.