Brainscape's Knowledge GenomeTM

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


See full index

Science > S Energy > Flashcards

S Energy Flashcards

1
Q

What is energy

A

Its is the ability to do work

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

What is potential energy

A

This is the energy that an object has due to its position or shape

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

What is kinetic energy

A

This is the energy of an object that is in Motion

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

What is chemical energy

A

Energy may be stored in chemicals like food fuels and explosives

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

what is light energy

A

Most of the energy present on earth originated from the sun. light from the sun provides energy for plants to grow make food and oxygen for us

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

What is heat energy

A

When energy is given to an object, the temperature of the object may increase. The particles that make up the object move around more when they get hot

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

What is electrical energy

A

It is very convenient because it’s easily converted into other forms of energy.

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

What is sound energy

A

It is a form of kinetic energy created when objects vibrate

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

What is nuclear energy

A

The nucleus of an atom has an enormous amount of stored energy. When the nucleus is disturbed the atom may release this energy

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

What is energy conversions

A

Energy can be changed from one form to another. whenever energy is converted the total amount of energy that is lost in one form will be equal to the amount of energy created in it’s new form

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

Why do we say energy is conserved

A

We said that energy is conserved. Is it because energy cannot be created or destroyed

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

Definition the principle of conservation of energy

A

Energy cannot be created or destroyed but only changed from one form to another

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

list of energies

A

Nuclear, light, heat, electrical, sound, kinetic, potential, chemical

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

What is our most important source of energy

A

The sun is our most important source of energy

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

what are fossil fuels made of

A

They are made of dead plants and animals have been converted to feuls over millions of years

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

What are fossil fuels made of

A

They are made of dead plants and animals have been converted to feuls over millions of years

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What does The Heat Of The Sun do for us

A

He keeps us warm and from freezing to death. It keeps plants alive and grows them

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

How does the sun cause wind and waves

A

The sun heats up the land and air. This causes wind and waves. The wind and waves can be used to generate electricity

19
Q

Whys the sun’s energy necessary for hydroelectricity

A

The sun’s energy is necessary to evaporate water to make rain. Rainforest rivers that are used to generate hydroelectricity

20
Q

What converts sunlight to heating and electricity

A

Solar panels and solar cells converts sunlight to heat and electricity

21
Q

What is renewable energy

A

A renewable energy source will never be used up

22
Q

What is non-renewable energy

A

Non-renewable energy source will not be regenerated in our lifetime

23
Q

Fossil fuels advantages

A

Easy to store and transport, relatively cheap, energy is available when needed

24
Q

Fossil fuel disadvantages

A

They will eventually be used up, fossil fuels that are imported are very expensive, they cause global warming, burning fossil fuels cause acid rain which can kill fish and trees

25
Q

What is nuclear fusion

A

Nuclear fusion occurs when two small nuclei are forced to join together. An enormous amount of energy is produced

26
Q

What is nuclear fission

A

The splitting of a large nucleus to create two smaller nuclei and energy is called nuclear fission

27
Q

Disadvantages of nuclear fission

A

Radioactive substances are made
fission reactors are expensive to build
Some products of nuclear energy can be used to make nuclear weapons

28
Q

Advantages of nuclear fission

A

Vast amount of energy can be produced from a small amount of fuel
no carbon dioxide or acid rain is produced unlike fossil fuels
therefore nuclear fission does not contribute to global warming

29
Q

Disadvantages of nuclear fusion

A

Controlled nuclear fusion has not been energy-efficient up to now
Fusion reactors are likely to be very expensive to build

30
Q

Advantages of nuclear fusion

A

A large amount of energy can be produced from a small amount of fuel
No carbon dioxide is produced and does not contribute to global warming
The fuel is cheap plentiful and available from seawater
The radioactive products formed become safe in a short period of time

31
Q

Original source of hydroelectric energy

A

Rivers can be dammed and the potential energy of the water can be converted into kinetic energy of the turbine and then into electricity in a generator

32
Q

What is biomass

A

Biomass is the harvesting of chemical energy from plants and other organic material. There are several examples of biomass

33
Q

What is wave energy

A

The kinetic energy of sea waves is used to generate electricity. Objects floating on top of the water can convert the kinetic energy of the water into electricity

34
Q

What is tidal energy

A

It is caused by the gravitational pull of the moon and the sun on the Earth
The energy of the moving water can be converted to electrical energy in two ways

35
Q

where does geothermal energy come from

A

Geothermal energy comes from hot rocks deep under the surface of the Earth

36
Q

What is wind energy

A

Use wind turbines to generate electricity. It is a very reliable source

37
Q

What is solar energy

A

The sun is our primary source of energy on earth. We can drop the energy of the Sun using solar panels. There are two types of solar panels.

38
Q

Name the two types of solar panels

A

One type heats water for use in the house

The second type is called a photovoltaic cell, it converts the sunlight into electricity

39
Q

What does sustainability mean in energy usage

A

Sustainability is the conversion of balance in the worlds ecology indefinitely

40
Q

What does sustainable energy usage mean

A

Sustainable energy usage means that the energy we use, will not damage the environment and will be available for many future generations at reasonable cost

41
Q

What can we do to make our energy use more Sustainable

A

Insulating buildings better, use more efficient appliances, take public transport, being sensible with energy at home, and choose renewable sources of energy.

42
Q

Calculating energy use

A

Work = force × distance

In this formula the force must always be in newton’s and the distance in metres

43
Q

Calculating power

A

Power= work done (in joules) or P = W
____________________ __

            Time take (seconds)                  T

Science (36 decks)

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