system
Given the following post, respond as if you're commenting on Reddit:
human
How are electrons generated from magnetism?

Spinning a copper wire in a permanent magnetic field will generate electric current, indefinitely. So if electric current is the movement of electrons carrying their charge to the opposite charge, and you have a load in between which converts the current to heat/light/etc, where do more electrons come from?

Edit: Thanks for some great explanations!
So electrons are neither created nor destroyed, they're just moving around, but what about a case where there is a load in the circuit that generates heat. Heat in this case is essentially lost energy but what is actually lost? The magnetism doesn't degrade and the electrons aren't lost. The only other energy is the force required to rotate the copper wire. So does that force equate to the heat energy?
gpt
You aren't creating electrons, you are moving them around, just like when a river flows down a hill you aren't creating water, you are just moving it downhill. 

(And if you never move it uphill, you will eventually run out of high-energy water, and the flow will stop, just like if you never recharge your batter, you will eventually run out of high-energy electrons and the electricity will stop.)