Secular, Christian, Eclectic, Worldview, K-4 HOMESCHOOL SCIENCE CURRICULUM /STEM STUDY UNIT STEM.

This is from Bonnie Rose Hudson, at WriteBonnieRose.com. This is a worldview study unit on electricity that I ADORE. Check it out. This is an affordable starter unit for children interested in robotics, electricity, energy and stem. It pairs great with Snap Circuits.
Bonnie has free and paid curriculum and study units available on her website.