How the clutch works?

Howdy,
I've searched, however I could not find . Is there any good explanation regarding the internal workings of the clutch in these motorized bicycle kits. When I pull the lever, what's really happening inside? What parts are contacting what? I'm the kind of guy who doesn't just take things for a fact, I HAVE TO know what's going on inside.

Any help is appreciated .

Thanks,
Vaughan

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If it ain't broke, and you mess with it long enough, it will be.

Thank you very much, these animations helped a whole lot.

thank you norm helped me alot knowing what i was going to have to do when i replace my plate and pads

That was jaw dropping.