I've got to ask because I know my students will ask (they have a game where they try to stump the teacher with physics questions.) A Watt is equal to a newton-meter per second, which is to say the amount of work done per second. Work is the amount of force applied for a distance. Ok, so a certain light bulb has an amount of 40 watts on it. In the light bulb, what force is being applied and what distance is being travelled?