N/S Physical

Question 1

A Source of Energy

Answer 1

Something that stores energy so it can be used later

Question 2

Non- Renewable energy

Answer 2

a Energy source that cannot be replenished once it has been used

Question 3

Fossil Fuels

Answer 3

Non-renewable
Coal, Crude oil, Natural gas

Question 4

Examples of Non-renewable fuels

Answer 4

Fossil Fuels and Nuclear Fuels

Question 5

Why do SA mine coal

Answer 5

Generate electricity
Make Fuel
Used for warming and cooking

Question 6

Coal consists mainly of

Answer 6

Carbon

Question 7

What is the byproduct when coal is used

Answer 7

Carbon Dioxide (CO2)

Question 8

What type of gas is Carbon Dioxide (CO2)

Answer 8

Greenhouse gas

Question 9

Greenhouse effect

Answer 9

Greenhouse gasses form a blanket around Earth
Prevents heat from escaping the atmosphere
Earth becomes warmer
Like a hot house/greenhouse

Question 10

Advantages of coal

Answer 10

Cheap
Creates jobs

Question 11

Disadvantages of coal

Answer 11

Pollution
Combustion releases lots of greenhouse gases
Coal reserves will be depleted in the long run (non-renewable)

Question 12

Advantages of crude oil

Answer 12

Used for many different fuels

Question 13

Disadvantages of crude oil

Answer 13

Has to be imported from other counties
Prices are variable, depends on politics & economy
(eg. war in Ukraine)

Question 14

Natural gas is used for

Answer 14

Cooking food & barbecue (gas braai)
Gas lamps
Heating
Generating electricity

Question 15

Where is SA’s nuclear power plant?

Answer 15

Koeberg, near Cape Town

Question 16

What is Uranium

Answer 16

A nuclear fuel
Found with gold in the crust of the earth - mined
On the periodic table - U
Radiates energy from the nucleus of the atom
Radioactive

Question 17

Advantages of Nuclear Fuel

Answer 17

Very little pollution when managed correct
Sustainable
Effective electricity supply
Safe when regulations are followed

Question 18

Disadvantages of Nuclear Fuel

Answer 18

Danger of pollution when not managed correct
Expensive to build nuclear power plant
Danger of radiation
Danger of dumping radioactive waste

Question 19

Renewable Resources

Answer 19

The energy is constantly replenished

Question 20

Examples of renewable resources

Answer 20

Solar
Wind
Hydro-electricity
Bio-fuels

Question 21

Solar energy

Answer 21

Earths most important energy - The Sun

Question 22

Advantages of solar energy

Answer 22

Simple design
Little repair & maintenance
No air pollution
Saving of electricity generation by non-renewable sources
Sun ovens can limit the cutting down of trees

Question 23

Disadvantages of solar energy

Answer 23

Expensive
Sun does not always shine, need batteries
Does not work at night

Question 24

First wind farm in SA

Answer 24

Near Darling in the Western Cape

Question 25

How does wind generate electricity

Answer 25

Wind - Turn turbines - Turning turbines generate electricity

Question 26

Advantages of wind energy

Answer 26

Relatively cheap Simple design No air pollution Powered without fuel

Question 27

Disadvantages of wind energy

Answer 27

Dependent on wind Not sustainable Noisy

Question 28

Where can a example of a watermill be seen

Answer 28

Canal at Kakemas

Question 29

Hydro-Electricity

Answer 29

Water falling down from a height can be used to generate electricity

Question 30

Advantages of hydro-electricity

Answer 30

Constant Available day & night Energy is freely available, no fuels needed No waste materials Relatively cheap once it is developed A large amount of energy can be produced

Question 31

Disadvantages of hydro-electricity

Answer 31

Expensive to develop

Question 32

Bio-fuels

Answer 32

Plant materials used for energy

Question 33

Uses for Bio-fuels

Answer 33

As fuel for cars in Heating & cooling systems

Question 34

Advantages of Bio-fuels

Answer 34

Guaranteed market for grain products Development & agricultural production is done in rural areas (job creation) By-product (waste) in manufacturing = a livestock feed with high nutritional value

Question 35

Disadvantages of Bio-fuels

Answer 35

Trees are chopped down Raw materials could rather have bee used as food Expensive to develop