What is its energy when the work done is positive?

Answer 1

First of all, let's get one important concept established. Energy is energy, and there is only one kind of energy. The only difference between what some people call positive or negative energy is point of reference. If the energy is coming towards you then it is called positive, and when it is moving away from you it is called negative. If the work that is done is constructive, then people tend to call it positive energy. If the outcome is destructive, they call it negative. In both cases, the same energy was used, just the results differed.

Here's an example. If you build a house, it is a positive result. But if you tear it down, it is negative. You still used you muscles and tools to do it, just the final result was different. But, now if you tear down an old building and erect a bigger and better new one, then was the tearing down negative or positive? See what I mean?

The same thing happens to electricity in circuit boards. They get bigger and smaller, diverted into different directions, stored and released, over and over again. The most important thing is what it made when it finished. If it made your mp3 player play your favorite tune, then you'd probably say positive. But if it didn't work, then somewhere the circuit is not directing the electrical energy to a positive result, music, but instead no music. Again, the same energy is being used, just the result may not be as 'positive.'