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GCSE Physics > P2 - Living For The Future > Flashcards

P2 - Living For The Future Flashcards

(60 cards)

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1
Q

What is our main source of energy?

A

The sun

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2
Q

What do photo cells do?

A

Generate electricity from sunlight

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3
Q

Summarise how solar cells work

A

1) They are made from silicone which is a semiconductor
2) It absorbs the sunlight, knocking electrons out of place
3) These flow around a circuit as electricity

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4
Q

What does the power output of a photocell depend on?

A
  • Surface area
  • Intensity of light
  • Distance from light source
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5
Q

What are the advantages of photo cells?

A
  • Low maintenance
  • Long lasting
  • No cables of food needed
  • It is a renewable source
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6
Q

What are the disadvantages of photo cells?

A

When there is no sunlight there is no power

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7
Q

How do curved mirrors concentrate energy from the sun?

A

The shape of the mirrors reflects the light to a concentrated point, which spins a turbine producing energy

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8
Q

How does passive solar heating work?

A

Suns rays are absorbed by a Matt black surface which heats cold water to make hot water

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9
Q

How do wind turbines work?

A

The rotors spin due to the wind powering a generator

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10
Q

What are the advantages of wind energy?

A
  • Renewable source
  • Carbon neutral
  • Cheap to run
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11
Q

What are the disadvantages of wind energy?

A
  • You need 1500 turbines for 1 power station
  • Visual and noise pollution
  • Take a lot of space
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12
Q

What does the national grid?

A

This connects power stations to consumers

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13
Q

What are the three main steps of power stations?

A

1) Fuel is used to heat water to make steam
2) Steam moves blades of a turbine
3) The movement powers a generator

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14
Q

What is electromagnetic induction?

A

The creation of voltage and current in a wire which is experiencing a change in magnetic field

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15
Q

What can you do to an electromagnetic induction to get a bigger voltage and current?

A

1) Increase the strength of the magnet
2) Increase the number of turns in the coil
3) Increase the speed of movement

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16
Q

How does electromagnetic induction work?

A

Either a electric conductor (cool of wire) moves through a magnetic field or a magnetic field is put through a electric conductor

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17
Q

What do step up transformers do?

A

They increase the voltage from the generator onto the grid

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18
Q

What do step down transformers do?

A

They decrease the voltage from the grid to homes

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19
Q

Why are transformers needed?

A

They need to increase so less energy is lost on the grid then decrease it so it is safe for homes

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20
Q

What is the equation for total energy input?

A

Total energy input = useful energy output + waste energy out put

(The output is broken up into two parts)

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21
Q

What is the equation for efficiency?

A

Efficiency = useful energy output / total energy output (x100)

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22
Q

What do running costs depend on?

A

An appliances power rating

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23
Q

What is the equation for power?

A

Power = voltage x current

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24
Q

What is a kilowatt hour?

A

The amount of electrical energy converted by 1 kW appliance left in for 1 hour

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25
What is the equation for energy supplied?
Energy supplied = power x time
26
What is the equation for cost?
Cost = number of units x price per unit
27
What is off peak electricity?
Electricity supplied during the night
28
What are the advantages with off peak electricity?
- Cost effective as power stations can't be turned off | - Cheaper for consumer
29
What are the disadvantages of off peak electricity?
- Increase risk that appliances are on at night | - You may change your lifestyle
30
What are the four steps of the greenhouse effect?
1) Energy from the sun is absorbed by the earth 2) The earth radiates heat 3) The radiation is absorbed by greenhouse gases 4) This is then re radiated in all directions
31
What are the three types of nuclear radiation that cause ionisation?
- Alpha - Beta - Gamma
32
What are alpha particles like?
- Two protons and neutrons - Big and heavy - Stopped by skin or paper - Strongly ionising
33
What are beta particles like?
- Electrons - Small and fast - Stopped by a few millimetres of aluminium - Moderately ionising
34
What are gamma rays like?
- Electromagnetic radiation (wave) - No mass or charge - Stopped by a few centimetres of lead - Weakly ionising
35
How do smoke detectors work?
1) They have a weak source of alpha radiation close to two electrodes 2) The radiation ionised the air 3) If there is smoke this will absorb the radiation and the current stops sounding an alarm
36
How do thickness gauges work?
- Beta is put through the paper - If it is too thick the radiation goes down and if it is too thin it goes up - This make it change to be correct thickness
37
How does medical sterilisation work?
Gamma kills all living cells so it will be able to sterilise equipment when hit
38
How is uranium used a a fuel?
The uranium splits into two releasing energy, this is used to heat the water just like in a power station
39
What are the advantages with nuclear power?
- Carbon neutral - More energy - Relatively cheap
40
What are the disadvantages of nuclear power?
- Expensive to build - Dangerous - Plenty of uranium
41
What is the best way to protect yourself from nuclear radiation?
Lead suit
42
How do people dispose of radioactive waste?
They bury them in secure places as they have a long half life so they last a long time
43
What is orbit do planets take?
Elliptical
44
What are the order of planets?
``` Mercury Venus Earth Mars Asteroids Jupiter Saturn Uranus Neptune (Mad Vampires Eat Mangoes And Jump Straight Up Noses) ```
45
How is the solar system held together?
Gravitational attraction
46
Which two planets do asteroids orbit between?
Mars and Jupiter
47
What are comets?
Balls of rock, dust or ice which orbit the sun at an elliptical orbit
48
What are near earth objects (NEOs)?
They are asteroids or comets that are on a collision course
49
How was the moon thought to have formed?
A mars sized planet hit into the earth causing debris which is the moon
50
What is a light year equal to in km?
9 460 000 000 000km
51
What happens when some stars explode?
Can leave black holes
52
What are the two means of exploring space?
- Manned spacecrafts | - Unmanned spacecrafts
53
What are the advantages of manned spacecrafts?
- Easier to get more information | - Much more reliable
54
What are the disadvantages of manned space crafts?
- It can be dangerous | - It is very expensive
55
What are the advantages of non manned spacecrafts?
- Much cheaper to make | - Stay in space for longer
56
What are the disadvantages of non manned spacecrafts?
- Problems could occur that can be solved easily | - Harder to find discoveries
57
How is the universe saw to be expanding?
- Distant galaxies have had red shifts (frequencies are lower than normal) - There are microwaves (thought to be from Big Bang)
58
What are the nine steps of the life cycle of a star?
1) Cloud of dust and gas 2) Force of gravity form a protostar 3) Temperature will get high enough that a hydrogen nuclei undergoes thermonuclear fusion and forms a helium nuclei. This makes a main sequence star 4) The hydrogen runs out and swells into a red giant SMALL STARS 5) The outer layer is ejects dust and gas making a planetary nebula 6) This leaves a hot, dense, solid core, which is a white dwarf BIG STARS 7) Red supergiants expand and contract until they explode forming a supernova 8) When he supernova explodes it throws dust and gas leaving a dense core which is a neutron star 9) When this is big enough it will become a black hole
59
What did Ancient Greeks think the universe was like?
The earth was in the centre
60
What was Copernican's model of the universe?
The sun was at the centre this was because of the phases of Venus

GCSE Physics (3 decks)

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