Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Physics P1 > Generation And Transmition Of Energy > Flashcards

Generation And Transmition Of Energy Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
1
Q

What is current

A

The flow of electrons around the circuit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is voltage

A

Potential difference an electrical pressure giving a measure of the energy transferred

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What it a.c

A

Alternating current it reverses its direction back and forth
It would show like a wave on a graph

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is direct current

A

It always flows in the same direction and would be a straight line in a graph

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is electrical power

A

The energy transferred per second

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Power=

A

Current x voltage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How do you use an ammeter

A

In series with the circuit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How do you use a Voltmeter

A

In parallel with the component you are testing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is electromagnetic induction

A

Moving a magnet in or near a coil of wire to create a voltage or current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

How does electromagnetic induction work

A

As you move the magnet the magnetic field through the coil changes this induces the voltage which pushes a current through the wire
You could also rotate a magnet in the wire or the wire around the magnet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What effects the size of the induced voltage or current

A

The strength of the magnet
The area of the coil
The number of turns in the coil
The speed of movement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How do generators work

A

They have a fixed wire with a magnet rotating around it

This is like a dynamo in a bike

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are non renewable energy sources

A

Coal
Oil
Natural gas
Nuclear fuels

They will run out one day
And they damage the environment

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are the problems with using non renewables

A

They all release co2 when burned
Burning coal and oil releases sulfur dioxide causing acid rain
Coal mining is messy
Nuclear waste is very dangerous
Nuclear power always carries the risk of disaster

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

How do power stations work

A

The fuel goes in as chemical energy
It is burned in the boiler
The heat energy goes to the turbine making it turn
The kinetic energy makes the generator work
The electrical energy goes to the power grid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

How do nuclear power stations work

A

Nuclear fission produces steam to drive the turbines

17
Q

What are the properties of renewable energy

A

It will never run out

They are unreliable and mostly depend on the weather

18
Q

Describe hydroelectricity

A

A valley is flooded by a big dam
Rainwater is caught and allowed out through turbines
This turns the turbines and creates the electricity

19
Q

Describe wave power

A

The waves provide an up and down motion which can power a generator
It can be useful on small islands
But is very unreliable

20
Q

What are tidal barrages

A

Big dams in river estuaries with turbines in them
As the tide comes in the barrages fill up and then the water can be let out through the turbines
It is reliable but not yet readily available

21
Q

What is wind power

A

Each turbine has its own generator

They only work when it is windy but there is little pollution

22
Q

Describe solar cells

A

The electric current comes directly from the sunlight

23
Q

What is geothermal energy

A

The hot rocks under ground are used to heat the water creating steam instead of burning the fossil fuels
There is a high setup cost

24
Q

What is biomass

A

NAT

25
Q

What must you consider when setting up a power station

A

Set up cost (it can be expensive to make them safe)
Set up time (gas power stations are quickest)
Running cost (renewables have the lowest running cost)
Reliability (non renewable are much more reliable until they run out)
Location(the power station must be near the stuff it runs on)
Environmental issues(if a fuel is involved there will be waste and the recourses are being used up,wildlife habitats are destroyed, hydroelectric could flood)

26
Q

What happens in the national grid

A

Electrical energy from power stations is taken to homes and industry
It allows power to be generated anywhere then taken anywhere
It needs a high voltage and high current but with a high current there is lots of heat energy lost
So it’s cheaper to keep the current low with the voltage high

27
Q

What are transformers

A

They step up the voltage at the start then back down at the end
They have two coils(primary and secondary) joined with an iron core

28
Q

What is a step up transformer

A

It has more turns on the secondary coil than the primary coil so it increases the voltage

29
Q

What is a step down transformer

A

It has more turns on the primary coil than the secondary and it reduces the voltage

30
Q

How to work out output voltage from a transformer

A 
Primary voltage (input)/secondary voltage(output) = no of turns on primary coil/no of turns on secondary coil
Vp/Vs= Np/Ns
31
Q

What are the problems with transmitting energy

A

It isn’t very efficient so energy loss is high
High voltage is a risk to people
Links with Leukaemia and living near high voltage power lines have been suggested

32
Q

Payback time=

A

Initial cost/ annual saving

33
Q

What is a kilowatt hour

A

The amount of energy used by a 1kw appliance in one hour

34
Q

Cost =

A

Power x time x cost of 1kwh

35
Q

What are the 9 types of energy

A

Electrical (whenever a current flows)
Light (sun light bulbs etc)
Sound (any noise)
Kinetic (anything moving has it)
Nuclear (released from only nuclear reactions)
Gravitational potential (anything that could fall has it)
Elastic potential (stretched springs elastic rubber bands)
Chemical (fuels food and batteries have it)

36
Q

What are the forms of stored energy

A

Chemical
Gravitational potential
Elastic
They are not actively doing anything just waiting for it to happen

37
Q

What is the principle of the conservation of energy

A

Energy can never be created or destroyed only ever transferred from one for to another

Physics P1 (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions