What is useful output energy?
Regarding this, what is the useful energy?
Useful energy. Useful energy is energy in the place we want it and the form we need it. Wasted energy is energy that is not useful enrgy. Useful energy and wasted energy both end up being transferred to the surroundings, ehich become warmer.
One may also ask, what is the useful energy output of a light bulb? It can only be transformed from one form to another. Thus the 100J of electrical energy is transformed to 5 J of light energy and 95J of heat energy. In the case of the light bulb the 95J of energy transferred as heat is wasted energy as it is not useful because the purpose of the device is to produce light.
Then, what is useful energy in physics?
This means that as much of the input energy as possible should be transferred into useful energy stores. How good a device is at transferring energy input to useful energy output is called efficiency . A very efficient device will waste very little of its input energy.
Why energy is so important?
Energy is essential to life and all living organisms. The sun, directly or indirectly, is the source of all the energy available on Earth. Our energy choices and decisions impact Earth's natural systems in ways we may not be aware of, so it is essential that we choose our energy sources carefully.