You can produce electricity by your own power! With the bicycle drive, you can set the generator into rotation and generate electric energy, which powers a small camera and a TV. The TV has a rated output from 60 watts, the camera about 5 watts. The generator has to serve this output. Because there and in the transmission is a frictional loss, you have to achieve about 100 watts to get the device in commission. The continuous output capability of the human is usually indicated with 70 watts. For a horse, you calculate with 700 watts, so it is 1 hp (1hp =736 Watts).