Energy Efficiency

If you can recognize the photo here, you’re at least 65 years old, probably 70+.  It’s a small generator that converted some of the kinetic energy from your moving bicycle’s tires into the electrical energy required to power your headlight.

It was one of the least efficient devices every to see commercial deployment.  I remember engaging it and instantly having to pedal far harder to make up for the ridiculously small amount of light energy it produced.  But, when you’re a kid, trying to get home alive, what’s the big deal?