it is said that energy cannot be created or destroyed but we can produce energy in body by eating food . we can also destroy energy by switch off the fan
Answers
Gobble down five bananas and you'll have enough energy to swim for about an hour. That's because your body is a complex machine capable of turning one kind of energy (food) into another kind (movement). Cars can pull off the same trick. Depending on which make and model you own, you probably know that it does so many kilometers or miles to the gallon; in other words, using a certain amount of energy-rich gasoline, it can transport you (and a moderate load) a certain distance down the road. What we have here are two examples of machines—the human body and the automobile—that obey one of the most important laws of physics: the conservation of energy. Written in its simplest form, it says that you can't create or destroy energy, but you can convert it from one form into another. Pretty much everything that happens in the universe obeys this fundamental law. But why, and what use is it anyway? Let's take a closer look!
What is the conservation of energy?
The first thing we need to note is that the law of conservation of energy is completely different from energy conservation. Energy conservation means saving energy through such things as insulating your home or using public transportation; generally it saves you money and helps the planet. The conservation of energy has nothing to do with saving energy: it's all about where energy comes from and where it goes.
Write the law formally and it sounds like this:
In a closed system, the amount of energy is fixed. You can't create any more energy inside the system or destroy any of the energy that's already in there. But you can convert the energy you have from one form to another (and sometimes back again).
no we can eat food while eating food carbohydrates gives us energy how let us understand
carbohydrates convert in sugar which react to form energy now this energy came from chemical energy which is transformed to give us energy not our body itself created energy
while switching off the conversion electrical energy to mechanical stop not distroy the energy it converted in to somewhere else and the fan stop