I need to understand in detail how to convert mechanical power to electrical power from someone who has knowledge of the subject.
Pretty broad. Did you want theory? Or simplified demos? Details of the operation of a small gasoline fueled motor-generator? Large scale commercial generation? DIY generation from some specific source of mechanical energy?
My understanding: A generator has various scale factors relating the speed of the generator shaft to output performance parameters. How are the scale factors used to determine the efficiency of power conversion from mechanical to electrical?