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physics flashcards > P1 Energy > Flashcards

P1 Energy Flashcards

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1
Q

Define dissipated

A

Spread out

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2
Q

Complete the sentence
When one energy store The other one

A

Increases, decreases

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3
Q

What is the unit of domestic energy consumption

A

K w h

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4
Q

What is the triangle for the equation of power

A

E
P T

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5
Q

What is the equation for power

A

P=E/T

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6
Q

What are the four si base units

A

Length in metres
time in seconds
current in ampères
Mass in kilograms

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7
Q

How do you convert from megawatts to watts

A

Times by a million

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8
Q

The prefix milli means

A

A thousand times smaller

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9
Q

How do you convert from centimetres to metres

A

Divide By hundred

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10
Q

How do you convert from millimeters to metres

A

Divide by a thousand

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11
Q

How do you convert from metres to centimetres

A

Times by a hundred

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12
Q

What is the triangle for the equation of gravitational potential energy

A

Ep
M G H

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13
Q

What are the three main uses of energy

A

Electricity production transport and heating

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14
Q

To convert from grams to kilograms

A

Divide by a thousand

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15
Q

How much is mega

A

One million times larger

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16
Q

What does s I stand for

A

The international system of units

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17
Q

Which energy source does not use a moving fluid to spin the turbine of the generator

A

Solar

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18
Q

What is a reliable energy source

A

It will work Regardless of the conditions

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19
Q

What is the unit of gravitational field strength

A

N/kg

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20
Q

Define efficiency

A

The ratio of useful energy output to total energy input it is A number between zero and one or zero percent and a hundred percent no Energy store is a hundred percent efficient

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21
Q

What is the gravitational field strength of the earth

A

Nine point eight

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22
Q

What is a kilo

A

One thousand times Larger

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23
Q

How do you convert from kilograms to grams

A

Multiply by a thousand

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24
Q

What is needed for a carbon neutral process

A

The carbon output must be equal to the carbon input

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25
Q

What is a wasted energy transfer

A

Unintended energy transfer

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26
Q

What is need to produce electricity and what does it consist of

A

An electrical generator which consists of coil of wire and a magnet

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27
Q

What is the unit of time

A

Seconds

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28
Q

What is the unit of mass

A

Kilograms

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29
Q

What will an increase in temperature do to the efficiency Of a machine

A

Decrease it

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30
Q

What does centi mean

A

One hundred times smaller

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31
Q

What is a renewable energy resource

A

One that can be replenished as it is used

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32
Q

What is a non renewable energy resource

A

One that is finite and cannot be replaced

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33
Q

What is the unit of height

A

Metres

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34
Q

What is the unit of gravitational potential energy

A

Jules

35
Q

What is useful energy transfer

A

Intended energy transfer

36
Q

How to calculate efficiency

A

Efficiency equals useful energy output divided by total energy input × 100

37
Q

What is energy density

A

The amount of energy for volume of material, the higher the energy density, the more valuable the material

38
Q

What is the calculation for kinetic energy

A

1/2×mass×speed

39
Q

What is the triangle for the equation of kinetic energy

A

Ek
0.5 M V2

40
Q

What is an unreliable energy resource

A

One that relies on a specific condition in order to work

41
Q

What is the gravitational potential energy calculation

A

Mass x gravitational field strength x Height

42
Q

What is the symbol for collectic energy

A

Ek

43
Q

What is the symbol for speed squared

A

V2

44
Q

What is the symbol for mass

A

M

45
Q

What are the three types of energy transfer

A

Buy a force, By heating, By waves

46
Q

What is the unit of energy

A

Joules

47
Q

What is elastic potential energy

A

Energy stored in object when stressed or compressed

48
Q

What is gravitational potential energy

A

Energy stored in an object above the ground

49
Q

What is Kinetic energy

A

Energy stored in a moving object

50
Q

What are the five energy stores

A

Kidnetic energy
Gravitational potential energy
Elastic potential energy
Thermo energy
Chemical energy

51
Q

What is power

A

The rate of energy transfer

52
Q

What is work done equal to

A

Energy transfer

53
Q

What is capacity

A

The maximum amount that something can contain

54
Q

What is work done

A

When a force moves an object through a distance

55
Q

What is the principle of conservation of energy

A

Energy can not be created or destroyed. It can only be transferred from one store to another

56
Q

What is a system

A

Two or more objects linked by energy transfer

57
Q

What is a closed system

A

A system when no matter or energy can enter or leave

58
Q

What is energy

A

The capacity of a system to do work

59
Q

What is work done equal to

A

Energy transfer

60
Q

What is thermal energy

A

Energy stored in an object due to its temperature

61
Q

What is chemical energy

A

Energy stored in chemical bombs

62
Q

What is the unit of power

A

Watts

63
Q

How to convert from what’s to megawatts

A

Divide by one million

64
Q

How to convert from meters to milimeters

A

Multiply by 1000

65
Q

What is specific heat capacity

A

The amount of energy needed to raise the temperature of one kilogram of a substance by one degree celsius

66
Q

What is the equation for thermal energy

A

Change in thermal energy=mass x specific heat capacity x change in temperature

67
Q

What’s the Triangle for the equation of thermal energy

A

∆E
MC∆θ

68
Q

what is conduction

A

conduction occours mainly in solids. it is the process where vibrating particles transfer energy to remaining particles

69
Q

what is thermal conductivity

A

a measure of how quickly energy is transferred through a material. materials with a high thermal conductivity transfer energy between particles quickly

70
Q

what are 2 ways you can reduce unwanted energy transfers

A

lubrication
insulation

71
Q

what is lubrication

A

lubrication reduces frictional forces,they are usually liquids like oil that can flow easily between objects and coat them

72
Q

what is insulation

A

insulation reduces the rate of energy transfer by heating

73
Q

what are 4 methods of insulation

A

cavity walls
loft insulation
double glazed windows
draught excluders

74
Q

what is convection

A

convection occurs only in liquids and gasses,convection is where energetic particles move away from hotter to cooler regions. the liquids and gasses can flow so the warmer and less dense regions will rise above denser cooler regions. if there is a constant heat source,a convection current can be created

75
Q

what are cavity walls

A

they are made up of an inner and outer wall with an air gap in the middle. the air gap reduces the amount of energy transferred by conduction through the walls. the gap is sometimes filled with foam

76
Q

what is loft insulation

A

it is laid out across the loft floor and ceiling. fibreglass wool is often used which is a good insulator as it has pockets of trapped air. loft insulation reduces energy loss by conduction and also helps prevent convection currents from being created

77
Q

what are double glazed windows

A

they work in the same way as cavity walls - they have an air gap between two sheets of glass to prevent energy transfer by conduction through the windows

78
Q

what are drought excluders

A

they are placed around doors and windows to reduce energy transfers by convection

79
Q

what is a non renewable energy resource

A

one that will eventually run out

80
Q

what is a reliable energy resource

A

one that will work regardless of the surroundings

81
Q

what are the non renewable energy resources

A

coal
oil
gas
nuclear fuel

82
Q

what are the renewable energy resources

A

solar
wind
tidal
hydro electric
geothermal
bio fuels

83
Q

what is wind power and what are the advantages and disadvantages

A

each wind turbine has a generator in it,the rotating blades turn the generator and produce electricity.
advantages:
very little pollution
no fuel costs
limited running costs
disadvantages:
visual pollution as you need lots to generate a decent amount of energy
they are very noisy
initial costs are high

84
Q

what is solar power and what are the advantages and disadvantages

A

solar cells generate electricity directly from sunlight. often used in remote places
advantages:
no pollution
very reliable in hot countries
energy is free
disadvantages:
unreliable in colder/cloudier places
initial costs are very high

physics flashcards (6 decks)

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