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Physics > P2 > Flashcards

P2 Flashcards

1
Q

How is enegry transferred?

A

It is transferred between stores, it is never used up

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2
Q

What are the different energy stores?

A
  • Thermal
  • Kinetic
  • Gravitational potential
  • Elastic
  • Chemical
  • Nuclear
  • Electromagnetic
  • Electrostatic
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3
Q

What is the conservation of energy principle?

A
  • Energy can be transferred usefully, stored or dissipated, but can never be created or destroyed
  • ENERGY TRANSFERRED(J) = power (W) x time (s)
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4
Q

What are the two types of energy resources?

A

Renewable and Non-ren
ewable

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5
Q

What are renewable resources?

A
  • Energy resouces that can be used and does not run out
  • Isnt as reliable as non rewable
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6
Q

What are non renewable resources?

A

Resources that will run out one day

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7
Q

How do power stations use steam to drive a turbine?

A

1)As the fossil fuel burns, the water is heated
2)The water then boils to form steam, whcih then moves and turns a turbine
3)The turbine is connected to an electrical generator, which generates a potential difference accross a wire by spinning a magnet near to the wire
4)The current produced by the generator flows through the national grid

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8
Q

What are some examples of renewable sources?

A
  • Solar cells- expensive but no environmental damage
  • Biofuels-made from plants and waste
  • Hydroelectricity- Building dams and flooding valleys
  • Tidal barrages-using the sun and moons on gravity
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9
Q

What is kinetic energy?

A

Energy of moving objects

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10
Q

What is chemical energy?

A

Anything with stored energy that can be released by a chemical reaction

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11
Q

What is elastic energy?

A

Energy stored in squashed, stretched ot twisted materials, rubber brands and springs are examples

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12
Q

What is elastic energy?

A

Energy stored in squashed, stretched ot twisted materials, rubber brands and springs are examples

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13
Q

What is magnetic energy?

A

Energy stored in two magnets attractring or repelling

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14
Q

What is electrostatic energy?

A

Energy stored in two electrical charges either attracting or repelling

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15
Q

What is nuclear energy?

A

Energy stored in the nucleus of atom

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16
Q

What is thermal energy?

A

Energy stored in objects that give off heat

17
Q

What is thermal energy?

A

Energy stored in objects that give off heat

18
Q

What is Gravitational Potential energy?

A

The energy stored by an object liftes up against the force of gravity.

19
Q

What is power?

A
  • The amount of energy transferred per second measured in watts(W)
  • power(W)= Energy transferred(J) / time(s)
  • Power is also the rate at which work is done
  • power(W) = work done(J) / time(s)
20
Q

What is conduction?

A
  • Vibrating particles transfering energy to neighbouring particles
  • When heating a metal, as end of metal gets heated, energy is transferred to metals kinetic energy store of particles at that end
  • This causes particles to vibrate faster and collide with neighbouring particles more with energy
21
Q

What is thermal conduction?

A

How well an object transfers energy by conduction

22
Q

What is convection?

A
  • The process by which heat is transferred by movement of a heated liquid
  • Because partivles aren’t fixed, once heated up they gain kinetic enrgy and all particles move around faster
  • more energetic particles to move away from warmer region towards colder region
23
Q

What is work done?

A

Work done is used with force to move an object an object by a certain distance

24
Q

What is conservation of energy?

A

Energy can be transferred usefully, stored or dissapated, but can never be created or destroyed

25
Q

How is nuclear energy obtained?

A

It is obtained via nuclear reactionns such as nuclear fission in nuclear power stations

26
Q

What is alternating current?

A
  • AC current is when the direction of current flow swaps back and forth
  • Gotten when using alternating potential difference
27
Q

What is direct current?

A
  • DC current is when the charge flows in one direction
  • it is either positive or negative
28
Q

What are the wires in a plug?

A
  • Live wire-Brown wire which alternates potential difference(230V)
  • Neutral wire-Blue wire which completes circuit by carrying awy current(0V)
  • Earth wire-Green and yellow wire which doesnt usually carry current but stops appliance becoming live(0V)
  • Each wire is made from copper to conduct electricity well
  • They are also coated in a layer of plastic to be able to differ them and for safety

Physics (6 decks)

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