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P1 Energy Flashcards

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
What is a wasted energy transfer
Unintended energy transfer
26
What is need to produce electricity and what does it consist of
An electrical generator which consists of coil of wire and a magnet
27
What is the unit of time
Seconds
28
What is the unit of mass
Kilograms
29
What will an increase in temperature do to the efficiency Of a machine
Decrease it
30
What does centi mean
One hundred times smaller
31
What is a renewable energy resource
One that can be replenished as it is used
32
What is a non renewable energy resource
One that is finite and cannot be replaced
33
What is the unit of height
Metres
34
What is the unit of gravitational potential energy
Jules
35
What is useful energy transfer
Intended energy transfer
36
How to calculate efficiency
Efficiency equals useful energy output divided by total energy input × 100
37
What is energy density
The amount of energy for volume of material, the higher the energy density, the more valuable the material
38
What is the calculation for kinetic energy
1/2×mass×speed
39
What is the triangle for the equation of kinetic energy
Ek 0.5 M V2
40
What is an unreliable energy resource
One that relies on a specific condition in order to work
41
What is the gravitational potential energy calculation
Mass x gravitational field strength x Height
42
What is the symbol for collectic energy
Ek
43
What is the symbol for speed squared
V2
44
What is the symbol for mass
M
45
What are the three types of energy transfer
Buy a force, By heating, By waves
46
What is the unit of energy
Joules
47
What is elastic potential energy
Energy stored in object when stressed or compressed
48
What is gravitational potential energy
Energy stored in an object above the ground
49
What is Kinetic energy
Energy stored in a moving object
50
What are the five energy stores
Kidnetic energy Gravitational potential energy Elastic potential energy Thermo energy Chemical energy
51
What is power
The rate of energy transfer
52
What is work done equal to
Energy transfer
53
What is capacity
The maximum amount that something can contain
54
What is work done
When a force moves an object through a distance
55
What is the principle of conservation of energy
Energy can not be created or destroyed. It can only be transferred from one store to another
56
What is a system
Two or more objects linked by energy transfer
57
What is a closed system
A system when no matter or energy can enter or leave
58
What is energy
The capacity of a system to do work
59
What is work done equal to
Energy transfer
60
What is thermal energy
Energy stored in an object due to its temperature
61
What is chemical energy
Energy stored in chemical bombs
62
What is the unit of power
Watts
63
How to convert from what's to megawatts
Divide by one million
64
How to convert from meters to milimeters
Multiply by 1000
65
What is specific heat capacity
The amount of energy needed to raise the temperature of one kilogram of a substance by one degree celsius
66
What is the equation for thermal energy
Change in thermal energy=mass x specific heat capacity x change in temperature
67
What's the Triangle for the equation of thermal energy
∆E MC∆θ
68
what is conduction
conduction occours mainly in solids. it is the process where vibrating particles transfer energy to remaining particles
69
what is thermal conductivity
a measure of how quickly energy is transferred through a material. materials with a high thermal conductivity transfer energy between particles quickly
70
what are 2 ways you can reduce unwanted energy transfers
lubrication insulation
71
what is lubrication
lubrication reduces frictional forces,they are usually liquids like oil that can flow easily between objects and coat them
72
what is insulation
insulation reduces the rate of energy transfer by heating
73
what are 4 methods of insulation
cavity walls loft insulation double glazed windows draught excluders
74
what is convection
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
what are cavity walls
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
what is loft insulation
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
what are double glazed windows
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
what are drought excluders
they are placed around doors and windows to reduce energy transfers by convection
79
what is a non renewable energy resource
one that will eventually run out
80
what is a reliable energy resource
one that will work regardless of the surroundings
81
what are the non renewable energy resources
coal oil gas nuclear fuel
82
what are the renewable energy resources
solar wind tidal hydro electric geothermal bio fuels
83
what is wind power and what are the advantages and disadvantages
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
what is solar power and what are the advantages and disadvantages
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 (8 decks)

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