We use electricity day in and day out; but have you wondered how it all works? Essentially, the electric current flows along a conductor in the form of free electrons that move from one atom to the next. Recall the secondary school science classes you thought you would never need again. The more free electrons you have in the current, the better it will conduct.

for details, check https://www.cdpower.com.au/understanding-the-basic-principles-of-electric-power/