s7 (f) renewable Energy
Getting things to change phase takes energy. Liquid water is heated by burning coal. This is a chemical reaction which produces new substances like pollution. The liquid is turning to a gas called water vapor. These bubbles are a gas. It is changing into a gas because we are adding thermal energy (heat). This water vapor can move turbines which generate electricity. This is how coal power plants work. Coal is a fossil fuel and is considered nonrenewable. Nonrenewable mean that the energy is not able to be quickly replaced.
A dam is an example of renewable energy. Water moves turbine to make electrical energy. Dams work by the water cycle which is a physical change and NOT chemical. Because of this renewable energy is considered clean energy because it does not create pollution or new substance through a chemical change.
When you take away energy, where does it go? For example if we can take way energy using a freezer. But where does the energy go- yes out the back of the freezer. That is why it is warm behind your refrigerator. Which is also why people do not cool their home by leaving the freezer door open. The law of conservation says that energy cannot be created or destroyed, just moved around. The amount of energy in our universe is constant. And on Earth most of the energy comes from the sun. For example a dam gets its energy from the water cycle, which is powered by the sun.
A dam is an example of renewable energy. Water moves turbine to make electrical energy. Dams work by the water cycle which is a physical change and NOT chemical. Because of this renewable energy is considered clean energy because it does not create pollution or new substance through a chemical change.
When you take away energy, where does it go? For example if we can take way energy using a freezer. But where does the energy go- yes out the back of the freezer. That is why it is warm behind your refrigerator. Which is also why people do not cool their home by leaving the freezer door open. The law of conservation says that energy cannot be created or destroyed, just moved around. The amount of energy in our universe is constant. And on Earth most of the energy comes from the sun. For example a dam gets its energy from the water cycle, which is powered by the sun.
