Efficiency Notes

Boost your understanding of work and energy efficiency! Practice calculating machine output and input energy.

Efficiency Video Watch and the answer the questions below. What is efficiency? How good a machine is at turning input energy in non-useful energy How good a machine is at turning input energy in useful energy You put 400 Joules of work into a machine and it only puts out 200 Joules of work. What is the efficiency of the machine? 200% 100% 50% 0% Where does the "lost" 200 J of energy go? Wherever it wants Converts to heat, sound, or light. Disappears from the universe Who knows? Can you ever have an efficiency of 100% or more? Yes No If you get an efficiency of over 100%, what does that mean you have most likely done? Flipped your equation I did nothing wrong Computed the right value because I can get over 100% efficency. Time to practice as a class with the "Efficiency Practice Problems"