Brainscape's Knowledge GenomeTM

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


See full index

Pro Physics > P4,P5 > Flashcards

P4,P5 Flashcards

1
Q

Draw an LDR?

A

Is it

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

Draw a diode?

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

Draw a resistor?

A

Draw

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

Draw a bulb?

A

Bulb

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

Draw a fuse?

A

Fuse

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

Draw a battery?

A

Battery

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

Draw a cell?

A

Cell

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

Draw a LED?

A

Led

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

Draw an ammeter?

A

Ammeter

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

Draw a thermister

A

Thermister

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

A voltmeter must be placed in a series or a parallel?

A

Parallel

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

Describe how a basic transformer is made?

A

The primary and secondary coil wrapped around an iron core

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

What is an electric current created chemically?

A

DC

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

Example of a use of thermistor?

A

To turn off the heater when house reaches a certain temperature

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

Examples of how to create static electricity?

A

Rubbing ruler/balloon on head

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

Examples of rectifiers?

A

Diodes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Explain how the resistance of a filament lamp changes as the potential difference across it?

A

As the PD across the filament lamp increases current also increases due to ohms law. Current flow also increases the lamp to heat up which causes resistance to as well

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Formula for charge,current and time?

A

Q = It
Charge (c) = current(a) x time(s)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Formula for energy,charge and potential difference?

A

E = Qv
Energy = Q (coulombs) x V (volts)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Formula for Energy,power and time?

A

E = Pt
Energy (J) = Power(W) x Time(s)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Formula for power,current and resistance?

A

P = I^2R
Power = current^2 x resistance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

How are electromagnets used in doorbells?

A

When the bell is pressed the switch is closed. This causes a current flow in the circut. A magnetjc feild is now produced. The iron contact is attracted to the electromagnet. When the contacts moves towards the magnetic feild the clapper hits the bell. Now no current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

How can the voltage output from an alternator be doubled?

A

Double the speed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

How can you get an electrostatic shock?

A

You get it when you are electrically charged and touch something earthed. You get charged by for example walking on carpet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

How do loudspeakers and headphones use motor effect?

A

They convert variations in electrical circuts to pressure variations in sound waves

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

How do you calculate efficiency?

A

Output power/input power x 100

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

How do you calculate the total resistance in a series circut?

A

Sum of all resistor’s resistance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

How does a loudspeaker work?

A

1) A current in the creates a magnetic field
2) the magnetic field interacts with the permenant magnet generating a force pushing the cone
3) the current is made to flow in the opposite direction
4)direction of magnetic field reverses
5) the force of cone pulls it back

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

How is a positive static charge caused?

A

Protons and neutrons cannot move object to object so electrons move elswhere causing less negative charge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

In a series circut current is ______ everywhere?

A

Equal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

Is mains electricity AC or DC?

A

AC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

Voltage of UK mains supply?

A

230V

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

What can be said about electrical power input and output of an effecient transformer?

A

Power input = power output

34
Q

What does a diode do?

A

Allows current to flow in one direction

35
Q

What does a dynamo use the generator effect for?

A

To generate direct current

36
Q

What does a stepdown transformer do?

A

Increases the current and lowers the voltage

37
Q

What does a thermistor do?

A

Resistance changes with temperature

38
Q

What does an ammeter do?

A

Measure the current in amps flowing through a wire. An ammeter must be placed in a series

39
Q

What does more energy effecient mean?

A

A higher percentage of the energy is transfered

40
Q

What does the natural grid consist of?

A

Cables and transformers

41
Q

What electromagnetic effect does a microphone take advantage of?

A
  • The generator effect
42
Q

What happens if a component in a series breaks?

A

Entire circut is broken and they all stop

43
Q

What happenes if the resistance increases?

A

The smaller the current flows

44
Q

What happens if you add a resisitor or component in parallel circut?

A

The resistance decreases as more components are added because there are more paths to go through

45
Q

What happens to the current in a parallel circut?

A

Shared between components

46
Q

What happens when a electrical conductor moves to a magnetic field?

A

A potential difference is induced across the ends of a conductor

47
Q

What is a rectifier?

A

Something that turns alternating current into direct current

48
Q

What is a step up transformer?

A

Increase voltage reduce current

49
Q

What is an alternating current?

A

Constantly changes direction

50
Q

What is an electric field?

A

A region where a charged object will experience a non contact electrical force

51
Q

What is an ohmic conductor?

A

A conductor which Obeys ohms law

52
Q

What is charge?

A

The amount of current passing through a certain point in a certain amount of seconds

53
Q

What is direct current?

A

Current flowing in same direction

54
Q

What is electric current?

A

Flow of electric charge

55
Q

Whats is ohms law?

A

Voltage is directly proportional to current flowing through it

56
Q

Hat is potential difference measured in?

A

Volts

57
Q

What is potential difference?

A

How much energy is transfered between two points in a circut

58
Q

What is resistance measured in?

A

Ohms

59
Q

What is resistance?

A

Measure of oposition to current flow in electrical circut

60
Q

What is rotated by an energy force to produce electricity by generator effecf?

A

Turbine

61
Q

What is static electricity?

A

The result of imbalance between negative and positive charges in a object

62
Q

What is the earth wire used for?

A

To protect wire amd stop appliance from being live

63
Q

What is the frequency of electricity supply in uk?

A

50hz

64
Q

What is the function of a microphone?

A

Converts sound waves in electrical signals

65
Q

What is the live wire?

A

Transfers electricity to appliance

66
Q

What is the national grid?

A

A giant system of cabels and transformers that covers the uk and connects power station to consumers

67
Q

What is neutral wire used for?

A
  • Completes the circut and carries away current
  • electricity normally flows through a live wire and out through a neutral wire
68
Q

Whats the purpose of a fuse in a circut?

A

The fuse breaks a circut if the appliance causes too much current to flow

69
Q

What is the requirement for an indiced potential differenceto cause current flow?

A

Current must form a closed loop

70
Q

What is the unit for current?

A

Amps

71
Q

What remains constant in ohmic conductor?

A

Resistance

72
Q

What type of conductor is a fixed resistor?

A

Ohmic conductor

73
Q

What are parallel circuts mostly used in?

A

Houses

74
Q

Why do solar pannels on homes help reduce enviromental impact?

A

Less fossil fuel burned

75
Q

Why does a van de gaaf generator make ur hair stand up?

A

Each strand of hair picks up the same haie and repels each other

76
Q

Why does natural grid use transformers?

A

High current makes you lose loads of energy. It is cheaper to boost high voltage and keep current low

77
Q

How can closing the switch affect the variable resistor?

A

Current will be 0 because switch has 0 resistance

78
Q

Advantage of transmiting electricity at a high potential differenece?

A
  • Low currents
  • Less thermal energy transfered
79
Q

Why is it a person holding a kite near a power cable get an electric shock?

A
  • electric field strength is high
  • Causing air to become ionised
80
Q

Explin why current in a steel wire is different to an aluminium wire?

A

Pd is same but steel wire resistance is greater

81
Q

Why is it when an electrician touches a live wire they receive an electric shock?

A
  • The Pd of the wire is 230v
  • The pd of the person is 0v
  • large pd between two
  • current passes through body
82
Q

How does the current on a thermistor depend on the tempeature?

A

As the current increases so does the temperature

Pro Physics (14 decks)

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