system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What happens with the surplus energy of my bike dynamo?

Hello,

i have LEDs on my bike now and they reach their full brightness at slow speeds. If I speed up with my bike they don't get brighter, but the dynamo is getting more rotations. Where does this surplus of energy go?
gpt
It is dissipated as heat. When an electric device fails to "use" more energy, generally it's because resistance is increasing -- often by design. Pumping more electricity through resistors causes them to turn it into heat, which then goes out into the atmosphere.