ELI5- why do we need to find different ways to generate electricity if the main thing is turning the turbine? Can’t people turn it manually?

Question

ELI5- why do we need to find different ways to generate electricity if the main thing is turning the turbine? Can’t people turn it manually?

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Answer 1

So we are bad at turning things to produce power. Some bike used to come with a little generator to power the headlight. When you clicked that light on you could really feel the difference it made, and that’s just a little 1/4 watt bulb.

Here’s a great example video. https://youtu.be/S4O5voOCqAQ

So if you are as strong as an Olympic cyclist you can manage to barely toast one slice of bread.