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Physics Electricity > Electricty > Flashcards

Electricty Flashcards

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1
Q

What is current

A

Flow of electrical charge

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2
Q

Current equation

A

Charge/time

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3
Q

Current and resistance relationship

A

The greater the resistance across the component,the smaller the current that flows through it

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4
Q

Charge definition

A

The size of a current is the rate of flow of charfe

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5
Q

Charge equation

A

Time * current

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6
Q

Ohms law definition

A

Electric current is proportional to voltage and inversely proportional to resistance

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7
Q

Ohms law equation

A

V=IR

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8
Q

What is pd/voltage

A

The difference of energy in electrons between points while travelling round the circuit

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9
Q

Ohmic conductor

A

The resistance of an ohmic conductor doesn’t change with the current

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10
Q

LDRs and resistance

A

When light intensity increases the resistance decreases

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11
Q

Thermistors and resistance

A

As the temperature increasing the resistance decreases

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12
Q

Series circuit

A

Components are connected from positive to negative terminal in one loop

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13
Q

Series circuit and pd

A

Scared to each component so always equal source pd
V=v1+v2

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14
Q

Series circuit and current

A

Current is same everywhere
I=I1=i2

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15
Q

Series circuit and resistance

A

Resistance adds up
R=r1+r2

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16
Q

Parallel circuit

A

Each component is connected separately to the positive and negative terminal

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17
Q

Voltmeter in circuit

A

Connected parallel always

18
Q

Ammeter in circuits

A

Always connected in series

19
Q

Parallel circuits and pd

A

Shared equally to all components

20
Q

Parallel circuits and current

A

Shared between branches

21
Q

Parallel circuits and resistance

A

Adding a resistor in parallel reduces total resistance

22
Q

Alternating current definition

A

Current ur constantly changing direction

23
Q

Mains frequency and voltage

A

F=50hz v=230v

24
Q

Direct current

A

Current flows sane direction from positive to negative terminal

25
Q

Neutral wire

A

Carries current out of circuit

26
Q

Live wire

A

Carries current into device

27
Q

Earth wire

A

Stops applicable from becoming live

28
Q

Energy transferred and power equation

A

Energy transferred = power* time

29
Q

Energy transferred and PD equation

A

Energy transferred = charge * pd

30
Q

Current and power equation

A

Power = pd * current

31
Q

National grid definition

A

A giant system of cells and transformers that covers the uk and connects to power stations. Transfers electrical power

32
Q

Step-up transformer

A

Increases pd and decreases current

33
Q

Step-down transformer

A

Decreases pd and increases current

34
Q

Static electricity

A

Caused by friction when insulting materials are rubbed together

35
Q

Power and resistance equation

A

P=I2R

36
Q

Power and voltage equation

A

P=v2/R

37
Q

Ohmic material

A

A material in which the current flowing through a resistor at a constant temperature is directly proportional to the voltage across the resistor.

38
Q

What is the relationship between potential difference and current for an ohmic conductor at a constant temperature?

A

Current is directly proportional to potential difference

39
Q

Resistance definition

A

anything that hinders the flow, of electrons

40
Q

What is a power rating

A

The maximum amount of safe power they can operate at

41
Q

Fuse

A

Will stop device from working by melting it if it goes over the maximum power rating

42
Q

Diode

A

allows current to flow easily in one direction, but severely restricts current from flowing in the opposite direction.

Physics Electricity (1 decks)

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