Useful and Non-useful energy transfers and renewable energy and non-renewable energy Flashcards
What are useful energy sources?
the things that you need from an energy transfer
What are non-useful energy transfers?
the things that you do not need
Describe the process of energy transfers using a car’s engine.
The energy input is oil. The useful energy output is kinetic energy. The non-useful energy outputs are thermal energy and sound energy.
Describe the process of energy transfer with a light bulb.
Electricity is input. Useful energy transfer is light and non-useful energy transfer is thermal energy.
What change will come in the energy when the electrons have gone to the positive side of a circuit after going through bulbs and other components.
The energy would decrease.
Natural resources
things that people use that come from nature
examples of natural resources
Light, air, water, plants, animals, stone, soil, minerals and fossil fuels
Non-renewable resources
things that can be used up. They have a fixed amount
Renewable resources
things that are replenished by nature in a very short time. They rely on natural processes.
Examples of non-renewable resources
Coal, oil, natural gas, nuclear energy, minerals. Even sunlight is a non-renewable source but there is so much of it that it can not be used.
Examples of renewable resources
plants, animals, water, air.
What must a source do to remain a renewable source?
They should not be used faster than nature can replace it.
For each tree cut down…
one must be planted
How does wind work?
hot air rises and cold air comes to replace it
What is the water process?
water cycle
Geothermal energy
Rainwater goes to the surface and then it travels down to magnetic heat source. Because the water is light because of the heat it travels up and humans use it. The steam can be used to spin turbines to generate electricity or heat can be extracted from the pipes for humans to use directly.
What was coal first?
plant
Why did coal change?
time+ pressure+ heat
Alternative
Renewable
How do we extract energy from the wind with turbines?
Turbines turn that energy into mechanical energy and mechanical energy will turn into electrical energy
Solar energy
Solar energy= sun energy—> electrical energy
Hydropower
water power. Energy captured from moving water. Hydrochloric acid.
Falling water with the help of gravity turn the turbines …
creating electricity.
Biomass/ Biofuel
fuel made from plants and animal waste. Energy is stored from the sun in the plant which can be turned in solids, liquids or gas that can provide energy from a human source.
What is the disadvantage of fossil fuels?
creates pollution
What is most of the energy we use?
non-renewable
What are 2 advantages of renewable resources?
less pollution
gets replenished
