Name:_Mayumi Togawa___________
Date:__01/27/10_ _________________
Definitions
1. Fossil fuels are one source of energy that people in current world heavily rely on, and are sustainable energy. The main examples of fossil fuels are oil and coal. Use of fossil fuels to get energy has caused carbon emissions, air pollution and global warming. Many professionals pointed that many forms of fossil fuel will scarce in several decades.
State two or more reasons why we should consider alternative energy sources?
—Because of the scarcity and unsustainable nature of fossil fuels, we need to alternate energy sources to sustainable sources.
2. Energy is the source that enables something to work. Most machines are enabled to work when energy is put in the form of electricity. Oil, coal and other forms of fuels are the potential source of energy, and by converting the energy to electricity, those machines are able to work.
List two or more types of energy
o Gravitational energy
o Electrical energy
3. Renewable energy is a form of energy that provides energy without reducing the capacity of natural environment. Renewable energy promotes sustainable system of society, and its development is highly needed to reduce environmental destruction.
List two or more types of renewable energy
o Solar energy
o Wind energy
4. What are the units for energy?
· Joule is the unit of energy for mechanical use. In English, it is also described as foot-pound.
· Calorie is the unit of energy for thermal use. In English, it is also described as British thermal unit (Btu). Btu is the heat to raise 1 pound water to +1 Fahrenheit.
· Watt-hour is the unit of energy for electrical use. The same term is used in English.
5. How is energy related to the growth of population and economy?
As the global population grows, the amount of energy used also grows. Also as the global economy grows, the appetite for energy grows. The current demand growth of energy is 2+% per year.
