Key facts on Energy !!

Question 1

Much of the energy that is transferred in our homes is supplied by electricity.

Answer 1

Energy resources are used to generate electricity

Question 2

Some energy resources are renewable and some are non-renewable.

Answer 2

Renewable resources - energy resources that can be replenished. They do not run out although we are using them.

Question 3

Non-renewable resources - energy resources that cannot be replenished. These resources will eventually run out because we are using them.

Answer 3

Not all energy resources are available everywhere and each one has its own advantages and disadvantages.

Question 4

Wind is an example of a renewable resource. Wind is caused by the movement of air. The wind turns a wind turbine which generates the electricity.

Answer 4

Advantages and disadvantages of wind
Advantages

Wind is a renewable energy resource.

Wind does not release any harmful gases.

There are no fuel costs involved in running a wind turbine.

Question 5

Disadvantages

Wind turbines can make a lot of noise and some people do not like to live near them because of this.

Some people think that wind turbines spoil the landscape.

Wind is an unreliable energy resource - the amount of electricity that is generated is dependent on how windy it is.

Answer 5

Water is an example of a renewable energy resource.

Like wind, moving water can also be used to turn a turbine. The turbine can then turn a generator.

Question 6

Advantages and disadvantages of using water as an energy resource
Advantages

There are no fuel costs.

No harmful gases are released.

Hydroelectric and tidal are reliable sources of power.

Answer 6

Disadvantages

Waves are not a reliable source of power. Waves are not consistent and a calm period means there are not waves to generate power.

Building dams and tidal barrages can harm habitats and displace people from their homes.