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Physics > P3 > Flashcards

P3 Flashcards

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1
Q

Electric fields are created by

A

Electric charges

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2
Q

What is the electric field line rule 1

A

Lines are drawn from positive to negative

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3
Q

What is the electric field line rule 2

A

They never cross

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4
Q

What is the electric field line rule 3

A

The density (how many) of the field lines on a diagram is indicative of the strength of the field (the field will get weaker when there is more distance between it and the charge)

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5
Q

What is electric field line rule 4

A

Arrows point out of positive charge and point into negative charge

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6
Q

What is a cell

A

A store of chemical energy

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7
Q

A battery is

A

A group of cells

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8
Q

A component is a

A

Electrical device in a circuit

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9
Q

Current

A

The rate of flow charge measured in amps

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10
Q

Energy is

A

The ability to do work

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11
Q

Potential difference is

A

How much energy is transferred between two points in an circuit

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12
Q

Power is

A

The rate of energy transferred

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13
Q

Resistance is

A

Measure of how difficult it is for the current to flow

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14
Q

Resistor

A

Component that makes it difficult for electrons to move through

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15
Q

Series circuit is

A

A electrical circuit with only one pathway

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16
Q

Short circuit is

A

Part of a circuit with low resistance allowing the current an easy shortcut path

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17
Q

Thermal energy is

A

Total energy in a object

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18
Q

Heat energy is

A

Amount of thermal energy transferred out and in

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19
Q

Work

A

The amount of energy transferred into or out of a system

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20
Q

Voltmeters are connected in a

A

Parallel branch of a component

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21
Q

Ammeters are connected in the

A

series branch (main branch)

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22
Q

Potential difference equation is

A

Current x Resistance

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23
Q

To find the total resistance of resistors in a SERIES you

A

Add them up

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24
Q

2 resistors in parallel have a total resistance —- than in series

A

Less

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25
Q

In series circuit: the total resistance is the sum of the

A

Resistance of each component

26
Q

In series, how is the current separated

A

It is the same through each component

27
Q

How is the potential difference separates in a series

A

It is shared between each component

28
Q

Parallel circuit potential difference

A

Is the same as the battery in all

29
Q

Parallel circuit current

A

Shared(splinted) in the branches

30
Q

What path does the current always take

A

The path of least resistance

31
Q

When the resistance halves, the current

A

Doubles

32
Q

In a thermistor, the resistance decreases as

A

Temperature increases

33
Q

Thermistors is used for

A

Temperature control

34
Q

What are the safety rules in a Experiment to investigate the resistance of a thermistor as its temperature changes

A

Hair tied back. No wires near flame. Use heat proof mat. Do not set up it near edge of desk

35
Q

What is ohms law

A

The c urgent is directly proportional to the p.d

36
Q

VIR equation

A

Voltage= Current x resistance

37
Q

What is electric current

A

The rate of flow of electric charge

38
Q

QIT equation

A

Charge= Current x time

39
Q

What is potential difference

A

The potential difference is the energy transferred per coulomb of charge

40
Q

EQV equation

A

Energy=chargexp.d

41
Q

Power is the

A

Rate at which energy is transferred (ie per sec)

42
Q

EPt equation

A

Energy=power x time

43
Q

PIV equation

A

Power= current x p.d

44
Q

PI2R equation

A

Power=current^2 x resistance

45
Q

In a LDR, resistance decreases as light

A

Increases

46
Q

LDR is used for

A

Lighting control (ie switching lights when it gets dark)

47
Q

What are the safety rules in the investigation of the resistance of an LDR at different light levels

A

Light bulb will will get hot so switch the lamp off when it not being used and avoid touching the bulb

48
Q

A resistor at constant temperature has a

A

Linear relationship and obeys Ohm’s law

49
Q

A filament lamp graph has a

A

Non linear relationship an it is does not obey ohms law. As the p.d increases the current increases

50
Q

A diode is

A

A component that has very low resistance in one direction but high resistance in the other

51
Q

Electrical working is the

A

Method of transferring energy from chemical stores to electrical components

52
Q

Fixed resistor is a

A

Component used to reduce flow of current inns circuit by fixed amount

53
Q

LDR

A

Light Dependent resistor

54
Q

Net resistance is

A

The resistance of a circuit if all the components were replaced by a single resistor

55
Q

Non linear circuit is

A

A circuit component that has a resistance that changes

56
Q

Sensing circuit

A

A circuit that contains a component that changes resistance with a change in environment

57
Q

A spark is

A

The breakdown of air that discharges a charged object/ the heating of air which provided light and sound

58
Q

Static electricity is

A

The charge that insulating objects get due to the transfer of negative electrons

59
Q

Thermistor

A

Component that decreases resistance With increase of temperature in surroundinnsn

60
Q

Variable resistor

A

A circuit component which has a resistance that can be varied by changing the amount of wire/or other resisting material

61
Q

Energy transferred in kilowatt per hour

A

kWh

Physics (5 decks)

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