Also, how large can the error be between these two?
In: 2
Electricity is really convenient. Devices draw as much as they need, and as long as we keep the generators turning at the same speed (and have enough of them) we will not overproduce or underproduce.
The difficult part is keeping them turning at the same speed. As we use more electricity, there is more force pushing against the wheels to slow them down. The engine needs to push harder to keep the speed the same. By adjusting the fuel and air flow to the engines, or water flow to turbines, we can make sure that it keeps spinning at roughly the same speed.
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