P2

Question 1

How is enegry transferred?

Answer 1

It is transferred between stores, it is never used up

Question 2

What are the different energy stores?

Answer 2

• Thermal
• Kinetic
• Gravitational potential
• Elastic
• Chemical
• Nuclear
• Electromagnetic
• Electrostatic

Question 3

What is the conservation of energy principle?

Answer 3

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

Question 4

What are the two types of energy resources?

Answer 4

Renewable and Non-ren
ewable

Question 5

What are renewable resources?

Answer 5

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

Question 6

What are non renewable resources?

Answer 6

Resources that will run out one day

Question 7

How do power stations use steam to drive a turbine?

Answer 7

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

Question 8

What are some examples of renewable sources?

Answer 8

• 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

Question 9

What is kinetic energy?

Answer 9

Energy of moving objects

Question 10

What is chemical energy?

Answer 10

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

Question 11

What is elastic energy?

Answer 11

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

Question 12

What is elastic energy?

Answer 12

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

Question 13

What is magnetic energy?

Answer 13

Energy stored in two magnets attractring or repelling

Question 14

What is electrostatic energy?

Answer 14

Energy stored in two electrical charges either attracting or repelling

Question 15

What is nuclear energy?

Answer 15

Energy stored in the nucleus of atom

Question 16

What is thermal energy?

Answer 16

Energy stored in objects that give off heat

Question 17

What is thermal energy?

Answer 17

Energy stored in objects that give off heat

Question 18

What is Gravitational Potential energy?

Answer 18

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

Question 19

What is power?

Answer 19

• 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)

Question 20

What is conduction?

Answer 20

• 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

Question 21

What is thermal conduction?

Answer 21

How well an object transfers energy by conduction

Question 22

What is convection?

Answer 22

• 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

Question 23

What is work done?

Answer 23

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

Question 24

What is conservation of energy?

Answer 24

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

Question 25

How is nuclear energy obtained?

Answer 25

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

Question 26

What is alternating current?

Answer 26

* AC current is when the direction of current flow swaps back and forth * Gotten when using alternating potential difference

Question 27

What is direct current?

Answer 27

* DC current is when the charge flows in one direction * it is either positive or negative

Question 28

What are the wires in a plug?

Answer 28

* 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