There are three things that matter in electricity, understanding electrostatics, that's like positive and negative, attraction and repulsion. Understanding Ohm's Law... so that's defining voltage, current and resistance. And finally Understanding Kirchoff's Laws, so that's how circuits behave. I you can get all that right you'll be absolutely golden and do really well in these topics.
Tricky thing is though, those aren't easy concepts to get your head around and the explain a huge number of contexts and phenomena!
We use models to explain abstract phenomena like electricity. Models are only so good as they fit with reality. Evaluate these models as you go through this topic, because none of them are the real thing, but they help you get an accurate concept of the real thing.
Get your head around this and then dive into the topics for more detail.
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