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Physics > Energy > Flashcards

Energy Flashcards

1
Q

Give 5 energy recourses/examples

A 
gravitational potential
chemical
heat
kinetic
elastic potential energy
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2
Q

what is work?

A

moving an object a distance against a force

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3
Q

what is gravitational potential energy/

A

energy due to height

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4
Q

what is chemical energy?

A

released when bonds form in a chemical reaction (eg. food, batteries and fuel)

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5
Q

what is nuclear energy?

A

energy found in the nucleus of atoms (the sun)

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6
Q

what is elastic potential energy?

A

energy in a stretched spring

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7
Q

what is kinetic energy?

A

energy due to movement

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8
Q

what is conservation of energy?

A

energy is neither created nor destroyed, it just changes from one form to another (eg chemical to heat)

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9
Q

what do sankey diagrams do?

A

tell us the efficiency of the energy transfer

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10
Q

what is the formula for efficiency?

A

useful output/energy input

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11
Q

what percentage of electrical energy is light?

A

20%

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12
Q

what percentage of electrical energy is heat?

A

80%

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13
Q

what is energy measured in?

A

Joules (J)

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14
Q

some energy transfers are ______

A

useful

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15
Q

some are______

A

wasted energy

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16
Q

give an example of wasted energy

17
Q

coal formula

A

chemical —- heat + light

18
Q

turbine formula

A

kinetic —- electrical

19
Q

how is energy wasted?

A

by working against friction or releasing large amounts of heat to reduce friction

20
Q

give 5 energy recourses

A 
nuclear
solar
hydroelectric
oil, coal and gas
wind
21
Q

what is convection/what does it do?

A

transfer heat in gases or liquids

particles with lots of heat move and take the place of cooler particles

22
Q

what is conduction/what does it do?

A

tranfers heat energy from one place to another

only in solids

hot metal—-kinetic energy—-lattice vibrations

23
Q

what is radiation/what does it do?

A

heat transferred by infrared waves through a vaccum

24
Q

why is metal a good conductor?

A

free electrons carry energy which collides

25
Q

where does radiation occur?

A

through transparent things

26
Q

give 3 conductors

A

copper, aluminium and diamond

27
Q

give 3 good insulators

A

glass, wood and wool

28
Q

what affects radiation?

A

colour or shinines (eg. black)

29
Q

give 5 renewable energy resources

A 
solar
wind
hydroelectric
bio fuels
wood
30
Q

give 2 non renewable energy resources

A

nuclear

oil, coal and gas

Physics (9 decks)

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