Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Physics > Energy Transfer p1 > Flashcards

Energy Transfer p1 Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
1
Q

What are the different types of energy stores?

A 
> Kinetic Energy 
> Gravitational potential energy
> Thermal Energy 
> Elastic Potential Energy 
>chemical Energy
>nuclear energy
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the equation for kinetic energy?

A

K.E = 1/2mv^2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

what is the law of conservation of energy?

A

Energy can’t be created or destroyed. Can only be converted from one form to another

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what is work done?

A

work done is energy transferred

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what is a system?

A

A system is an object, place, a person (anything)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what is a closed system?

A

when energy is unable to enter or leave the system so net change stays the same. Net change in energy is 0.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is hook’s law?

A

Force applied is proportional to the extension of the material until elastic limit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the equation for gravitational potential energy?

A

Gpe=mass x height x gravitational field strength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is specific heat capacity?

A

Amount of energy needed to raise the temp of 1 kg of a substance by 1 degrees Celsius

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the formula for efficiency?

A

Useful energy/total energy x 100

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the formula for change in thermal energy?

A

Mass x specific heat capacity x change in temp

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is power?

A

the rate at which work is being done

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what is conduction?

A

transfer of heat energy from a substance to another by direct contact

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what is radiation?

A

Transfer of energy in the forms of electromagnetic radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what is convection?

A

Transfer of heat energy fromthrough a fluid caused by molecular motion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what is thermal conductivity?

A

measure of how quickly heat energy is transferred through a material

17
Q

what is lubrication?

A

Used to reduce friction between the objects’ surfaces when they move- reduce the amount of energy lost as heat

18
Q

how do we insulate our homes?

A

to insulate our homes we use materials with low thermal conductivity to prevent excessive heat loss through

19
Q

what is the equation for elastic potential energy?

A

1/2 x spring constant x extension^2

20
Q

what are the many ways we can reduce heat loss from our homes?

A 
Reducing heat loss through convection:
>Draught Excluders 
>Cavity Wall Insulation 
> Loft Insulation 
Reducing heat loss through conduction:
> Double Glazed Windows
21
Q

what is renewable energy?

A

energy source that can’t run out

22
Q

what is non renewable energy?

A

energy source that will run out eventually

23
Q

what is the equation for elastic potential energy?

A

E.P.E = 1/2 Spring constant x extension^2

24
Q

what are non renewable energy resources used for?

A

< Transportation e.g petrol, diesel (made from crude oil)

< Heating e.g natural gas, coal, electric heaters

25
Q

what are renewable energy resources used for?

A

< Transport (vehicles that run on bio-fuel)
Geothermal: Heat pumps use geothermal energy to heat buildings. Water is pumped into the ground to be heated up and warm water is pumped out of the ground and is transferred into the water system of buildings for purpose of heating.
–>Solar water heaters: They use the sun’s energy to heat up the water.
—>Bio-fuel: can be used to generate electricity to heat up buildings

26
Q

what are the advantages and disadvantages of using wind power?

A

Advantages:

  • ->No pollution
  • ->Cost effective
  • ->turning of the turbine generates electricity

Disadvantages:

  • ->Spoils the view
  • ->Noise pollution
  • ->unpredictable, when wind stops electricity is not generated
27
Q

what are the advantages and disadvantages of using solar cells?

A 
Advantages:
-->Reliable source of energy
-->No pollution
-->Cost effective
Disadvantages:
-->unreliable in cloudy countries e.g UK
-->unable to produce energy in the night
28
Q

What are the advantages and disadvantages of using geothermal energy?

A 
Advantages:
-->reliable source of energy
-->No pollution
-->Cost effective
Disadvantages:
-->only suitable in certain locations e.g near volcanoes (Iceland)
29
Q

what are the advantages and disadvantages of using hydro electric power?

A 
Advantages:
-->cost effective
-->reliable source of energy
Disadvantages:
-->Releases methane and carbon dioxide 
-->flooding may cause loss in habitat for some species
30
Q

what are the advantages and disadvantages of using wave power?

A 
Advantages:
--> no pollution
--> cost effective
disadvantages:
-->Unreliable (waves die when wind drops)
-->spoils the view 
-->hazard to boats 
-->disturbs habitats of marine animals
31
Q

what are the advantages and disadvantages of using tidal barrages?

A

Advantages:
–>No pollution
–>Reliable source of energy
Disadvantages:
does not work when water level is the sames at either sides
–>lower tides provides less energy than bigger spring tides

32
Q

what are the advantages and disadvantages of using bio-fuels?

A 
Advantages:
-->reliable source of energy
-->minimal running costs
Disadvantages:
--.>high cost to refine bio-fuel
-->decaying and burning release carbon dioxide 
---> takes space for crop production
33
Q

what are the advantages and disadvantages of using non-renewables?

A 
Advantages:
-->very reliable
-->cost effective 
Disadvantages:
-->burning fossil fuels contributes to global warming
-->coal mining ruins the view 
-->releases sulphur dioxide (acid rain)
34
Q

what are some of the reasons people use renewable energy resources?

A
  • ->renewable energy damages environment less than non renewable
  • ->pressure from other countries and public meant government have began to introduce targets which then puts pressure on energy providers to introduce power plants using renewable resources to ensure no business and money lost
35
Q

what is the formula for power?

A

power = work done / time

36
Q

what is power measured in?

A

watts

37
Q

What is the formula for efficiency?

A

Useful energy output /total energy output

38
Q

Why is touching a live wire dangerous?

A

Touching a live wire causes a current to flow through you causing a large electrical shock which can injure or kill

Physics (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions