Voltage

https://www.youtube.com/watch?v=hJD8ywGrXks&list=PLTjLwQcqQzNKzSAxJxKpmOtAriFS5wWy4
00:00 Positive and negative electric charge
01:12 Charge separation generates voltage
02:58 Voltage is energy per charge
05:33 Voltage source and electric current
08:09 Is voltage dangerous?
More: https://en.fufaev.org/voltage