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Flashcards in Science - Physics - Energy Deck (17):

Is energy created or destroyed?

Neither! It is converted from one form to another.


Name the 9 different types of energy.

Light - luminous objects
Sound - vibrating objects
Thermal (heat) - hot objects
Chemical - stored energy
Kinetic - movement
Electrical - current flows
Gravitational potential - anything high up
Elastic potential - anything that can stretch
Nuclear - atom splitting


What is a chemical?

Any object that can store energy.
E.g. Fuels, food, batteries.


Name 3 fossil fuels.



How are fossil fuels formed?

From plants and animals that died many years ago:
1. Plants and animals died and fell to the ground.
2. Water from swamps covered the plants and animals with rock, sand and mud.
3. The plants and animals could not decay because they were not in contact with oxygen.
4. Over time the dead plants and animals decomposed into organic materials and formed fossil fuels.


What is the difference between renewable and non-renewable energy resources?

Renewable energy does not run out but non-renewable energy can run out as it takes a long time to form.


What is biomass?

A form of renewable energy where material such as trees, plants or even leftover paper and cardboard that can't be recycled is burned to produce energy.


What are this disadvantages of renewable energy?

Some types of renewable energy is weather dependent e.g. Wind/solar/waves.
Some types of renewable energy cause visual pollution. E.g. Wind
Some types of renewable energy cause sound pollution.


Define solar energy.

Light and heat is harnessed from the sun.


Movement, heat and light are all types of what?



What are the properties of 'good fuel'?

Give out a lot of heat.
Are easy to light.
Burns steadily.
Are very flammable.
Burn with a clean flame.
Are easy to transport.


Where are oil and natural gas formed?



Explain 'wind energy'. ( no farting jokes please).

Air moves around because different pockets of air is warmer than others.
The wind moves the propellers on the wind tower which turns a generator.
The generator produces electricity.


What is tidal or ocean energy?

Electricity is generated from the movement of the waves, the tides, the currents, the salinity gradient and the thermal gradient of the sea or ocean.


What is geothermal energy?

Deep wells are drilled into hot rocks far below the surface of the earth.
Cold water is pumped down to the rocks, heated and returned to the surface to drive turbines and electricity generators.


What is hydroelectric energy?

Hydropower is a clean, renewable and reliable energy sources which converts kinetic (movement) energy from falling water into electricity.


What is the formula to work out energy efficiency?

Efficiency = useful energy output/total energy output x 100