This interactive, multitouch book covers most of the main concepts about current electricity and circuits.
Although it is primarilywritten for GCSE Physics, most of the content will be relevant to Science/Physics curricula in many countries.
It’s a free worth-while recap into currents related to physics
It gets 4 stars as it’s a free short recap into physics current based sciences. I recommend it as a quick read and walk through for anyone interested in the topic, it’s very interactive too, which is nice!