Science: term 4 exams 🍩🍯🍔🥘📝📕📚🖍✏️

Question 0

What is output energy

Answer 0

Energy after it has gone through a device

Question 1

What is a source and a device

Answer 1

Source : were I thing comes form or starts device : somming witch changes one type of energy into a different type of energy

Question 2

A source can be a ……l..,,.

Answer 2

Battery

Question 3

What does this mean : kettle light bulb buzzer motor

Answer 3

Kettle : heat light bulb ; light buzzer : sound motor : movement

Question 4

What does insulate mean

Answer 4

Covers In a protective substance such as plastic

Question 5

What is a conductor

Answer 5

Material that allows electricity to pass through it

Question 6

What is live wire

Answer 6

Wire with electricity running through it

Question 7

What does source mean

Answer 7

Where a thing comes from or starts

Question 8

What does Device mean

Answer 8

Something which changes one type of energy into a different type of energy

Question 9

What is the role of the circuit

Answer 9

The role of the circuit is to send electricity from the source to the device. The device then changes the electricity into a useful output energy

Question 10

What are the three components of a simple circuit

Answer 10

• a source of energy
• conducting material
• device

Question 11

Tell me about source of energy

Answer 11

The source is where a device gets its energy.

Question 12

What can the source of energy for electricity be

Answer 12

It can be the mains electricity

Question 13

What is a broken pathway of electricity

Answer 13

Is when the pathway is broken and the flow of electricity has stopped

Question 14

What does a diagram mean

Answer 14

A simple drawing or sketch

Question 15

What is a symbol

Answer 15

Simple sign which represents something else

Question 16

What is a electrical circuit made up of

Answer 16

Electricity source
Cooper wire
Device
Switch, which can be open or closed

Question 17

What metals conduct electricity

Answer 17

Copper gold silver aluminum

Question 18

Why do we use copper as a conductor

Answer 18

It is a very good conductor and it is not expensive

Question 19

What is a insulated

Answer 19

Material that does not allow heat/electricity to pass through it

Question 20

Give some examples of insulators

Answer 20

Glass ceramic plastic rubber wood

Question 21

What is love wire

Answer 21

Wire with electricity

Question 22

Name 5 different uses of insulators

Answer 22

Rubber gloves plastic cove glass insulators plastic coated pliers plastic covered adaptors

Question 23

Name the solution for this: many car accidents happen at night because people cannot see in the dark

Answer 23

Street lights

Question 24

Name the solution for this: buildings get destroyed and people get injured because fires are not noticed sooner

Answer 24

Fire alarms

Question 25

Name a solution for this:cars get stolen when drivers leave them to open their gates at home

Answer 25

Electric gates can be opened without getting out of the car

Question 26

How were fossil fuels formed

Answer 26

Fossil fuelsFormed in the earths crust millions of years ago they are source of energy that comes from plants and animals That were once living when the sand might and rocks hard and they compress the dead plants and the patient hate was so strong that they were able to change the ones live in Callington animals into fossil feels such as coal oil and natural gas this part of years I found all over the world and under the sea

Question 27

How fossil fuels formed in the ocean

Answer 27

When microscopic plants and animals died they fell to the ocean floor forming layers of Richmond over millions of years is Laser my do I compress by Sanderson oil stones and on and turn into oil and natural gas

Question 28

Explain the steps from coal to electricity

Answer 28

Energy from the sun gets absorbed by the plants which is heat and light energy the plants then die and turn to coal over millions of years which are stored energy call his mind and then burnt and in a boiler at a power plant to heat water into steam which is heat energy the steam put is a fan inside the wheels of a turbine which is movement energy the turbine wheels power generator which changes the movement energy into electricity which is electrical energy electricity is then set is a step up transformer which increases the power of the electricity to send it over long distance is witches electrical energy in the stepdown substation to see the electricity which decreased the power of the T to make it safe in our homes which is electrical energy electricity runs from the plugs are a wire into the television device which changes it into sound and light energy

Question 29

Why is running coal mines expensive

Answer 29

Because you have to pay the Mineworkers by mining equipment and fixed the current equipment

Question 30

What is the cost of transporting is it expensive for the coal mines

Answer 30

Because although most of our coal-fired power stations I need to call mines transporting called to the power stations is expensive

Question 31

Where are the biggest power stations and what are they called

Answer 31

Biggest power stations are medupi in Limpopo and kusile in Mpumalanga

Question 32

How can we save Energy

Answer 32

by using less electricity

Question 33

Why do we use energy saving lightbulbs

Answer 33

Because normal lightbulbs convert 20% of the electricity until light and 80% of the heat this wastes electricity as we do not use this heat more recent lightbulbs called compact fluorescent lightbulbs convert 80% of their electricity into light and I need 20% went to heat do you spell discuss more than other traditional lightbulbs but they last for much longer and of course day is much less energy

Question 34

Name some ways of saving a electricity

Answer 34

Use less hot water shall instead of passing switch off appliances were not using them have a party when cooking use the kettle to boil water instead of a part and only use as much water as you need bring food to boil on heart and then turn the play down to low heat so that the food sinners do you not use the oven or stove to heat the home make sure that the rubber seals the other than fridges are not worn out turn off lights when no one is in the room turn off all appliances that are in standby mode on the plugs that is your TV cell phone chargers and DVD player turn off the geezer when you do not need to use it

Question 35

What are nonrenewable energy sources

Answer 35

Fossil feels are non-renewable energy sources

Question 36

Name some examples of renewable energy sources

Answer 36

The sun wind and water

Question 37

How is Wind a Renewable resource

Answer 37

When turbines use the wind to generate electricity

Question 38

How is the Sun A renewable | Source

Answer 38

Solar panels are use the energy from the sun

Question 39

Why is water a renewable source

Answer 39

How do I electrical power stations use the energy and water to generate electricity

Question 40

How do wind turbines work

Answer 40

Huge blade is called wind turbines use the energy of the wind and converted to electricity. when there are many of these winter months place together on large pieces of land it is called a wind farm when the wind blows it turned the huge blades.These blades then turn the turbines.The turbine then gives energy to machine is called generators which generate electricity

Question 41

How do you solar panels work

Answer 41

A solar panel is the device that uses the energy of the Sun it’s Alexa energy of the sign and transfers the energy of the sign into electricity or heat this energy is then sent to our home is through construction on solar panels have to be carefully positioned to make sure that they catch as much sun as possible

Question 42

How do you hydro electric power work

Answer 42

Step 1. water runs into a dance step 2. water flows through big wheels core turbines in the dam on step 3. the water turns the wheel step 4.the water gives energy to machines cogenerators which produce electricity step 5. electricity runs along powerlines to all homes step 6. the water flows into the sea and then returns to the mountains by the water cycle