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Physics > Energy stores > Flashcards

Energy stores Flashcards

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1
Q

What is Magnetic energy, with an example.

A

The energy stored when repelling poles have been pushed together or when attracted poles are pushed apart.
Example: Fridge Magnet, Compass

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2
Q

What is thermal energy, with an example?

A

The total kinetic and potential energy of the particles in an object. Example: Stoves, human bodies and hot coffee.

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3
Q

What is chemical energy, with an example?

A

The energy stored in chemical bonds, such as those between molecules. Example: Food and muscle

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4
Q

What is Kinetic energy, with an example

A

The energy of a moving object. Example: Buses, runner

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5
Q

What is electrostatic energy, with an example

A

The energy stored when repelling charges are moved closer together, and attracting charges are moved farther apart. Example: thunderclouds

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6
Q

What is electrostatic energy, with an example

A

The energy stored when repelling charges are moved closer together, and attracting charges are moved farther apart

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7
Q

what is Elastic potential energy, with an example

A

the energy stored when an object is stretched or squashed. example: compressed springs, inflated balloons

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8
Q

what is gravitational potential energy with an example

A

the energy of an object at height. example: aeroplanes, kites

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9
Q

what is nuclear energy and what’s an example

A

the energy stored in the nucleus of an atom. example: nuclear reactions

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10
Q

what is mechanical work

A

a force moving an object through a distance

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11
Q

what is electrical work

A

charges moving due to potential difference

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12
Q

what is radiation with an example of it

A

energy transferred as a wave. e.g infrared

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13
Q

what is dissipation

A

energy waste / energy spreading to surroundings

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14
Q

what is the equation for kinetic energy

A

1/2 x mass x speed squared

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15
Q

grams to kg equation

A

divide by 1000

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16
Q

elastic potential energy equation

A

1/2 x spring constant x extension squared

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17
Q

cm to metre equation

A

divide by 100

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18
Q

cm to mm equation

A

times by 10

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19
Q

cm to mm equation

A

times by 10

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20
Q

gravitational potential energy equation

A

mass x gravitation field strength x height

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21
Q

the equation for the change in thermal energy

A

mass x specific heat capacity x change in temperature

22
Q

change in temperature equation

A

final temperature - starting temperature

23
Q

power equation

A

potential difference x current

24
Q

energy transferred equation

A

power x time

25
Q

symbol for power

A

Watts

26
Q

symbol for power

A

Watts

27
Q

symbol for energy

A

J (Joules)

28
Q

symbol for electrical current

A

A (Amperes)

29
Q

equations for power

A
  1. energy transferred divided by time
  2. work done divided by time
30
Q

what is the conservation of energy in a closed system

A

the net change in energy will always be zero

31
Q

what are materials with low thermal conductivity like

A

they transfer less heat energy and make good insulators

32
Q

what are materials with low thermal conductivity like

A

they transfer less heat energy and make good insulators

33
Q

what are materials with high thermal conductivity like

A

they transfer more heat energy and make poor thermal insulators

34
Q

what does insulation reduce

A

the rate of heat transfer out of an object

35
Q

what can lubrication reduce

A

energy loss by making surfaces smoother

36
Q

what does a small decrease in temperature say about an insulator

A

it’s good

37
Q

what is energy efficiency

A

how much energy is transferred to useful energy and how much is wasted

38
Q

efficiency equation

A

useful output energy divided by total input energy

39
Q

total energy equation

A

useful energy + wasted energy

40
Q

Name 3 Non renewable energy sources

A

coal, oil, gas, nuclear fuel

41
Q

what does non renewable mean

A

can’t be replenished after use

42
Q

advantages of non renewable energy sources

A
  1. nuclear fuel doesn’t produce greenhouse gases
  2. fossil fuels (coal,oil,gas) are reliable
  3. enough of fossil fuels in storage incase increase in energy demand
43
Q

disadvantages of non renewable energy

A

1.fossil fuels release carbon dioxide (CO2) which contributes to global warming as co2 is a greenhouse gas
2. coal and oil release sulphur dioxide which can react and cause sulphuric acid which can lead to acid rain
3. non renewable energy resources will run out

44
Q

examples of renewable energy sources

A

solar power, wind power, wave power, biofuels

45
Q

what is renewable energy

A

energy that can be replenished after use

46
Q

solar power advantages and disadvantages

A

advantages:
-no pollution
-reliable
disadvantages:
-a lot of energy required
-can only be generated during the day
-less reliable in countries with less sun

47
Q

what is wind power

A

wind turbines rotating in the wind to generate electricityn

48
Q

wind power advantages and disadvantages

A

advantages:
-produces zero pollution
-no permanent environment damage
disadvantages:
-not reliable as they cannot generate if there’s no wind
-electricity production can’t be increased if energy demand goes up

49
Q

what is wave power

A

waves that turn turbines which are placed upon coastlines to produce electricity

50
Q

wave power advantages and disadvantage

A

advantages:
-zero pollution
disadvantages:
-unreliable
-can destroy habitats
-disturbs animals

Physics (1 decks)

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