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Physics > Static and current Electricity > Flashcards

Static and current Electricity Flashcards

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1
Q

Polythene rod

A

Gains electrons

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2
Q

Perspex rod

A

Loses electrons

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3
Q

Earthing

A

Occurs when a charged object loses its charge to the earth through a conductor

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4
Q

Static electricity

A

A build up of electric charge that can occur on good insulators e.g. Polythene and Perspex rods

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5
Q

Electric current

A

Is a flow of electric charge (electrons)

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6
Q

Conductors

A

Are substances which allow electric current to flow through them freely

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7
Q

Closed circuit

A

needed for the current to flow. If there is a break in a circuit then the current won’t flow.

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8
Q

Energy provided

A

By a battery or power pack,it is needed to move the current around the circuit

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9
Q

The battery pumps electrons

A

From its negative end around a circuit

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10
Q

The electrons are attached

A

Back to the positive end of the battery

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11
Q

Potential difference

A

The difference in electrical pressure between the positive and negative ends of a battery/power pack

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12
Q

Whenever there is a potential difference

A

Electricity will flow

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13
Q

This potential difference is known as

A

Voltage and is measured in volts

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14
Q

Resistance

A

Is the opposition to the flow of electrons the unit is the Ohm and it is measured using an ohmmeter

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15
Q

AC

A

Alternating current changes very quickly, many times a second

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16
Q

DC

A

Direct current goes in one direction only e.g. The current in a battery

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17
Q

Mains supply

A

A.C. It flows at a potential difference of 230 volts

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18
Q

The ring circuit

A

Made of live neutral and earth wires. Sockets are tapped off at points along this ring circuit

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19
Q

The mains supply

A

Is AC it flows at a potential difference of 230volts

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20
Q

Ring circuits

A

Made of live neutral and earth wires . Sockets are tapped off at points along this ring circuit

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21
Q

Fuse

A

A fuse is a safety device that prevents the circuit from overheating.
It will melt when it is too hot breaking the circuit

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22
Q

Circuit breaker

A

A circuit breaker is used in the fuse board of the home and this trips to stop the flow of current from entering the house

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23
Q

Live wire

A

The live wire is brown and carries most electricity it is connected to the plugs fuse on the right hand side

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24
Q

Neutral wire

A

The neutral wire is blue and is connected to the left the hand side

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25
Q

Watt (W)

A

Is the unit of electrical power

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26
Q

ESB charges a fee for the number of

A

Kilowatts (1000 Watts) used per hour

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27
Q

ESB’s unit of electricity is

A

The kilowatt hour (kWh)

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28
Q

A Kilowatt hour is

A

The electrical energy used by a 1kW appliance running for 1 hour

29
Q

Earth Wire

A

The earth wire is a safety wire no electricity flows in the earth wire unless the appliance it is attached to becomes “live” eg a toaster in this case the

30
Q

Watt

A

The watt is the unit of electrical power

31
Q

The ESB charges a fee for the number of

A

Kilowatts (1000Watts) used per hour

32
Q

ESB ‘s unit of electricity

A

Is the kilowatt hour

33
Q

A kilowatt hour

A

A kilowatt hour is the electrical energy used by a 1 kW appliance running for1 hour

34
Q

Fuse

A

Is a safety device that prevents the circuit from over heating,it will melt when it is too hot,breaking the circuit

35
Q

Circuit breakers

A

Is used in the fuse board of the home, and this trips, to stop the flow of current from entering the house

36
Q

Heating effect

A

Boil water in a kettle immersion heater electric cooker fuse in a plug

37
Q

Chemical effect

A

Electroplating cheap metal with more expensive metal e.g. Silver , electrolysis (splitting) of water , mobile phone battery

38
Q

Magnetic effect

A

Electromagnet made with a wire wrapped around a nail electric motor speakers circuit breaker in fuse board

39
Q

Live wire

A

Is brown and carries most electricity it is connected to the fuse on the right hand side

40
Q

Neutral wire

A

Is blue and is connected to the left hand side

41
Q

DC

A

Direct current goes in one direction only e.g. The current from a battery

42
Q

AC

A

Alternating current changes very quickly many times a second

43
Q

Electronics

A

Is the careful and exact control of tiny amounts of electric current

44
Q

A diode

A

Is a component that will allow current to flow in one direction only

45
Q

Forward biased

A

If the positive end of a battery is connected to the positive end of a diode the diode is said to be “forward biased” and current can flow

46
Q

Reverse biased

A

If the positive end of the battery is connected to the negative end of the diode it is said to be “reverse biased” and no electricity can flow

47
Q

A diode can be used to…

A

Change the alternating current to direct current

48
Q

Electronic devices such as radios, tape recorders and calculators

A

Need low voltage direct current

49
Q

A light emitting diode

A

Is a diode that gives out light when a current flows through it

50
Q

Current will only flow when a LED is…

A

Forward biased

51
Q

LED’s use only tiny currents so…

A

A resistor must be connected in series with it

52
Q

LED’s are useful as they are…

A

Cheap,reliable and long lasting and use far less current than other light bulbs

53
Q

A Light Dependent Resistor is …

A

A resistor that whose resistance depends on light

54
Q

When lit falls on a LDR

A

Its resistance decreases, this low resistance will allow a current through the circuit

55
Q

Heating effect

A

boil water in a kettle, immersion heater, electric cooker , fuse in plug

56
Q

Chemical effect

A

Electroplating cheap metal with more expensive metal e.g. Silver, electrolysis (splitting) of water, mobile phone battery

57
Q

Magnetic effect

A

Electromagnet made with a wire wrapped around a nail, electric motor,speakers, circuit breaker in fuse board

58
Q

Electronics

A

Electronics is the careful and exact control of tiny amounts of electric current

59
Q

Diodes

A

A diode is a component that will allow current to flow in one direction only

60
Q

Forward Biased

A

If the positive end of a battery is connected to the positive end of a diode the diode is said to be forward biased and current can flow

61
Q

Reverses Biased

A

If the positive end of the battery is connected to the negative end of the diode it is said to be Reverse Biased and no electricity can flow

62
Q

A diode can be used to

A

A diode can be used to Change alternating current into direct current

63
Q

Electronic devices such as radios need low voltage direct current

A

H

64
Q

A light emitting diode

A

A light emitting diode that gives light when a current flows through it

65
Q

Current will only flow when LED is

A

Current will only flow when LED is forward biased

66
Q

LEDs use only tiny currents so

A

D

67
Q

LED s are useful as they are

A

LED s are useful as they are cheap reliable and long lasting and use far less current than other light bulbs

68
Q

A light Dependent Resistor

A

A light Dependent Resistor is a resistor who’s resistance depends on light

69
Q

When light falls on an LDR

A

When light falls on an LDR its resistance decreases this low resistance will allow a current through the circuit

Physics (11 decks)

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