“How does the law of conservation of energy works in our society?” This is a question students often ask at the start of their first physics class. Although it is not always possible to give a clear answer to this question, it is important that they understand how this law operates.
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A “work-energy” is a set of numbers that represents the amount of energy required to do work. The more energy a source has, the more work it can do. Energy is either used up or added to a source when an action (work) is done or when energy is exchanged between a source and a receiver. If you have a source that is free to add or take energy from, then you can say the work-energy is constant.
However, if you need to make a difference between a source that needs energy and a source that add or take energy from a source, then you can say that the work-energy changes from time to time. The change is caused by changes in the environment around the source.
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The first type of change to which the work-energy will be affected at the start of a lesson is that of the environment around the source. For example, if the source is located near the teacher’s desk, then the work-energy will be influenced by the teacher. On the other hand, if the source is located far away from the desk, then it will be more influenced by the student’s physical movements.
The second type of change is the change that occurs as a result of using power for a task. If you need electricity to use the television set and the room where you watch the TV has a power shortage, then you will have to use the television set less than you would if the room had a power supply. The results of using power can also change the work-energy. For example, if you want the TV to stay on, then you must use less energy than if you want it to switch on automatically.
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The third type of change is the change that occurs when you need to obtain the power to do something else. For example, when you need to use a radio to listen to the radio, you are not going to need as much energy as if you have a power supply than if you have an electric socket. If you want to have the fridge opened, you will need to use more energy because you need the fridge to store energy than you use energy from the fridge.
When the work-energy is used up, then another process will need to be undertaken to replace it. These processes can be divided into two categories, either energy transfer or energy production.
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The type of change that requires energy transfer is when one thing is replaced by another. For example, if you need more power to run the television, then energy transfer is going to take place. It may be replaced by taking the old energy source (the energy that was originally used in the production of the TV) and transferring it into a new source (another television) or by creating a new energy source (an alternative energy source).
The other category of change is energy production. Energy production takes place when the energy input into the process exceeds the energy output of the process. This energy is stored as heat energy. Heat energy is needed to make the other energy sources available to the other process or processes. Therefore, when the production of heat energy exceeds the energy input into the process, the energy source is used up and the other process does not need to take that energy from the energy source.
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In addition to these three categories, there are a number of other methods that you can implement to keep your power usage at a minimal level. Examples of these are: reducing your electric usage and conserving energy with efficient appliances such as a hybrid car or a home energy audit. You can also reduce your use of power by using alternative sources such as solar energy or wind power.
As you can see, there are many types of changes that take place throughout the life of any project. You need to think about how your changes relate to the energy input and the changes in the physical world as a whole.
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