Brainscape's Knowledge GenomeTM

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


See full index

Physics 🔭 > P7 Energy > Flashcards

P7 Energy Flashcards

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

What is magnetic energy store?

A

Energy stored when like poles are pushed closer together / opposite poles pulled further apart

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

What is thermal energy store?

A

Due to vibrations of particles in object - hotter = vibrates faster

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

What is chemical energy store?

A

Energy store associated with chemical bonds eg those between molecules

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

What is kinetic energy store?

A

Energy associated with a moving object

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

What is electrostatic energy store?

A

Energy stored when like charges are moved closer together / opposite charges moved further apart

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

What is elastic energy store?

A

Energy stored when an object is stretched, squashed or twisted

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

What is gravitational energy store?

A

Energy associated with an object at height

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

What is nuclear energy store?

A

Energy associated with nuclear interactions

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

When a ___ occurs, energy is ___ from one ___ to another

A

Change
Transferred
Store

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

What is mechanical energy transfer?

A

When forces act to cause a change
Eg a car

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

What is electrical energy transfer?

A

When an electric current flows in a circuit
Eg a mobile phone

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

What is thermal energy transfer?

A

When heat energy is transferred through the motion of particles
Eg a radiator

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

What is radiative energy transfer?

A

When electromagnetic waves transfer energy
Eg photosynthesis

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

What is the law of energy conservation?

A

The total amount of energy stored in a closed system is constant. It can only be transferred from one form to another

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

What is efficiency?

A

A measure of how much input energy is transferred in a useful way

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

When a ____ acts on an object, there will be a…
We say…

A

Force
Transfer of energy
Work is done

17
Q

How can we make mechanical devices more efficient?

A

Lubrication to reduce friction - reduces wasted energy in the form of thermal

18
Q

Why are nuclear power stations often located by the coast?

A

Large volume of water required for cooling

19
Q

What is specific heat capacity?

A

The amount of energy needed to raise the temperature of 1kg of a substance by 1 degree

20
Q

The higher the specific heat capacity…

A

The more energy the material can hold
The longer it will take to heat up or cool down

21
Q

Salty water has a ____ specific heat capacity than ____ water

A

Lower
Fresh

22
Q

Would it be better to build a nuclear reactor by a fresh water lake or the coast?

A

Fresh water lake because fresh water has a higher specific heat capacity - will absorb more energy but only raise its temp by a small amount

23
Q

Define specific latent heat

A

Energy needed to break intermolecular bonds and cause a change of state of 1kg of a material

24
Q

What is thermal conductivity?

A

A property of a material that measures the rate of energy transfer through a material

25
Q

How do we make a fair test for thermal conductivity?

A

Area of 1m squared
Thickness of 1m
Temp difference across it of 1 degree

26
Q

How does insulation slow rate of cooling?

A

Traps air in foam
Air is poor conductor of heat - slows conduction

27
Q

What is the rule for current in a series circuit?

A

Same everywhere

28
Q

What is the rule for potential difference in a series circuit?

A

Total pd = sum of pd across components

29
Q

What is the rule for resistance in series circuits?

A

Resistors in series increases overall resistance
Add them together

30
Q

What is the rule for current in parallel circuits?

A

Split between branches

31
Q

What is the rule for potential difference in parallel circuits?

A

Each branch has same pd as power supply

32
Q

What is the rule for resistance in parallel circuits?

A

Overall resistance is less than any of the individual resistors

33
Q

Power = ?

A

Rate of energy transfer

34
Q

Efficiency = ?

A

The percentage of the input energy transferred into useful stores

35
Q

Dissipation = ?

A

The transfer of energy to the thermal store of the surroundings

36
Q

Unit for energy?

A

Joules

37
Q

A unit is…

A

1 kilowatt hour

38
Q

Define kilowatt hour

A

A kilowatt hour is the amount of energy transferred by a 1 kilowatt device when switched on for 1 hour

Physics 🔭 (12 decks)

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