Chapter 7

A simple definition of energy is

• the disability to do work

• the ability to do work

• the ability to change direction

• the ability to push and pull

A device that can change a form of energy to another is called as

• converter

• transformer

• changer

• charger

Non renewable source of energy cannot be replenish. This mean once it was used, it cannot be replaced.

• True

• False

• Not sure

Fossil fuels are the non renewable. Which of these are not a fossil fuels.

• Natural gas

• Coal

• Crude oil

• Wind

Resources such as oil, natural gas and coal soon be used up, what do you think the best thing we should do?

• Stop using all these resources at once

• Find another alternative sources of energy which is renewable

• Speed up the production of oil, natural gas and coal

• Import more sources from another country

• Prepare plan to live on another planet and abandon earth

Which one is non renewable sources of energy

• Solar

• Wind

• Nuclear

• Tidal

Even though solar and wind can be used repeatedly, the main disadvantages of them are

• unlimited

• always available when needed

• expensive to build

• difficult to harness

One way to reduce dependency towards non renewable sources of energy is by conserving electricity. Another meaning of conserving is to

• change

• save

• keep

• harvest

• waste

All of these are ways of conserving energy are EXCEPT

• let television on all night because you need the light

• Turn on the radio all days to scare away the monkey on your back yard

• Use fans instead of air conditioning during cold session

• Change all the filament bulb to LED

• Use bicycle for short distance instead of drive a car

Best way for saving electricity during away trip for camping outdoor is

• turn off CCTV system at home

• use separate car among siblings because it hard to get along when driving

• leave the fans on and air conditioner off at home

• turn off all the unnecessary light in the house