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Science > Energy > Flashcards

Energy Flashcards

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1
Q

What is kinetic energy ??

A

Energy of a moving object

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2
Q

What is gravatational potential energy ??

A

Energy possesed by a body above the ground

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3
Q

What is elastic strain energy ??

A

Energy of a stretched object

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4
Q

what is chemical energy ??

A

Energy story in fuels e.g coals, oil, gas

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5
Q

what is nuclear energy ??

A

Energy stored inside atons

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6
Q

What is the input and output energy of a microphone??

A

Sound

Electrical

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7
Q

What is the input and output energy of a motor??

A

Electrical

Kinetic

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8
Q

What is the input and output energy of a loudspeaker ??

A

Electrical

Sound and kinetic

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9
Q

What is the unit of energy??

A

Joule (J)

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10
Q

How many joules are in 1kJ ??

A

1000 joules

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11
Q

What is the law of conservation of energy ??

A

Energy can neither be created nor destroyed although it can change from one form to another

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12
Q

Name 3 things in your home which contain electric motors ??

A

Microwave
CD player
Hair dryer

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13
Q

What provides the energy for a normal car engine ??

A

Petrol

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14
Q

In what form is the energy input for a car ??

A

Chemical

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15
Q

In what form is the useful energy output of a car??

A

Kinetic

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16
Q

How do u find the efficiency of a device ??

A

Useful energy output divided by energy input times 100

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17
Q

What is oil made from and used for ??

A

It is made from Dead Sea creatures and it used for heating, electricity and transport

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18
Q

What is coal made from and used for ??

A

It is made from plants and animals and is used for heating and electricity

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19
Q

What is gas made from and used for ??

A

Gas is made from plants and animals and is used for electricity, heating and cooking

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20
Q

What are nuclear fuels used for ??

A

They are not burnt to release energy instead the fuels are involved In a nuclear reaction and they are used for electricity

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21
Q

What is wind power caused from and used for ??

A

It is caused form heat from the sun and wind

It is used for electricity in

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22
Q

What is the ocean waves cussed by and what are they used for ??

A

They are caused by the movement of air over the water

And are used for electricity

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23
Q

What is solar energy and what is it used for ??

A

Solar energy is radiant light from the sun harnessed using a range of ever evolving technologies
And it is used to heat water and make electricity

24
Q

Wha is tidal energy caused by and used for??

A

It is caused by the pull of gravity of the sun and moon

The movement of tidal through a barrage can be used to make electricity

25
Q

What is biomass ??

A

Plants from which we get energy e.g cutting down trees and burning them

26
Q

Should electricity be added to the list of large scale energy sources ??

A

No, because electricity is generated from the sources

27
Q

Why are oil,coal and gas fossil fuels ??

A

Because the materials must be formed from dead fossils

28
Q

Explain the difference between renewable and non renewable energy sources

A

Renewable energy will never run out where as non-renewable energy will

29
Q

Explain the difference between polluting and non polluting energy sources

A

Polluting adds harmful substances to the environment where ass non polluting does not

30
Q

Is oil Non renewable or renewable

A

Non renewable

31
Q

Define energy

A

Energy is what we need to make things happen

32
Q

What is global warming ??

A

A gradual increase in the overall temperature of the earths atmosphere.

33
Q

List 3 effects the global warming is having on the earth

A

Ice is melting worldwide
Sea level rise becoming faster
Coral bleaching

34
Q

List 2 ways in which we could ensure that we do not waste energy

A

Turn of plugs after using

Energy saving lights

35
Q

Name a long term solution in reducing our greenhouse gas emissions is to use alternative energy sources

A

solar panels

36
Q

Why is there an energy problem in the world today??

A

Our energy comes mostly form coal oil and gas which are non renewable resources which will soon run out so we need to save energy and rely more on renewable sources

37
Q

Nearly all energy comes from the ____

A

Sun

38
Q

In what unit should we measure heat energy ??

A

Joules (j)

39
Q

In what unit do we measure temperature ??

A

Degrees Celsius

40
Q

Temperature is a measure of how ____ something is

Thermal energy is the energy needed to ____ the temperature of a thing

A

Hot

Change

41
Q

Is thermal energy the same as temperature ??

A

No

42
Q

Name 2 everyday situations in which heat is transferred

A

Kettle-water

Hair straighteners- hair

43
Q

If heat energy can travel quickly along a material, that material is called a ……

A

Good thermal conductor

44
Q

In general _______ are good thermal conductors

A

Metals

45
Q

If heat energy cannot travel quickly along a material, that material is called a …….

A

Good thermal insulator

46
Q

In general _______ are good thermal insulators

A

Non metals

47
Q

Trapped air is the _____ thermal _______ and ______ ________ conductor

A

Best
Insulator
Thermal

48
Q

Give some examples of materials which are good insulators because of the air they trap

A

Fleesy coasts

Duvet

49
Q

Oh what direction does hot water travel ??

A

Up

50
Q

In what way does cold water travel??

A

Down

51
Q

_________ is the flow of heat through a liquid or a gas by upward movement of the particles of the substance

A

Convection

52
Q

What is radiation ??

A

Radiation is the flow of heat by means of waves

53
Q

Dull, black surfaces are good ______ of radiation

A

Absorbers

54
Q

Light coloured, shiny surfaces are good ______ of radiation

A

Reflectors

55
Q

Light coloured, shiny surfaces are _____ ________ or radiation

A

Poor emiters

56
Q

Our electricity is generated in power stations which burn coal or air. We also burn these fuels when we heat our homes. What gas is produced in large amounts when these fuels are burned ??

A

Carbon dioxide

57
Q

How does carbon dioxide Damage the environment ??

A

Because it pollutes the air and let’s out more greenhouse gases which leads to global warming.

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