i had a hamster
doing just the thing you asked... tho it was a miniscule bulb that was attached to it's exercise wheel...
and wait a scond! doesn't this remind anyone of the matrix' conspiracy concept... maybe some sinister initiatives are putting these into our minds with the ultimate goal of turning humans into sustained power-cells! ...what ever the fuss, this thing you mention is something quiet unfeasible if you plan on doing it to make electricity for running your home appliances; and if you are keen on finding a rotational device that is able to generate usable electricity for your home, you sohuld look into the wind power.