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electricty Flashcards

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1
Q

what is a conductor

A

a material that lets electricity through it

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2
Q

what is an insulator

A

a material that doesn’t let electricity through it

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3
Q

do conductors have free elections

A

yes

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4
Q

do insulators have free electrons

A

no

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5
Q

what is the resistance inversely proportional to

A

the cross sectional area

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6
Q

what is resistance directly proportional to

A

the length

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7
Q

which way does current flow

A

from positive to negative

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8
Q

which way do the electrons flow

A

from negative to positive

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9
Q

what does electrical charge equal

A

current X time`

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10
Q

current is always the same in a

A

series circuit`

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11
Q

voltage in a series circuit equals

A

V1+V2+V3+V4………

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12
Q

what is ohms law

A

resistance=voltage/current

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13
Q

what does A mean

A

amps

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14
Q

what does V mean

A

voltage

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15
Q

which does the diode not obey

A

ohms law

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16
Q

Ways to increase the strength of a magnetic field

A

Increase the current flowing/ number of turns of the coil or place a soft iron core inside the solenoid

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17
Q

The force of the field lines get what as they get further away

A

Weaker

18
Q

Where do magnetic field lines run from

A

North to South

19
Q

Flemings ______ hand motor rule

A

Left

20
Q

FLHMR thumb =

A

Movement

21
Q

FLHMR forefinger =

A

Field

22
Q

FLHMR second finger =

A

Current

23
Q

Power =

A

VI or I2R or V2/R

24
Q

Energy =

A

ITV or I2RT or (V2/R)T

25
Q

Power is

A

The rate at which work is done or energy is transferred

26
Q

Power = gen

A

Energy/time

27
Q

Power is measured in

A

Watts

28
Q

Energy =

A

QV

29
Q

1/Rtotal =

A

1/r1 + 1/r2……

30
Q

RCD means

A

Residual current device

31
Q

Energy gen =

A

powerXtime

32
Q

What are the three wires

A

Live neutral and earth

33
Q

Live wire is

A

Brown

34
Q

Neutral wire is

A

Blue

35
Q

Earth wire is

A

Green and yellow stripes

36
Q

Wh does the fuse melt

A

To create a gap to stop the current

37
Q

The closer the field lines are

A

The stronger the force is

38
Q

The direction of the force is predicted using

A

FLHMR

39
Q

Symbols for cell battery and wire

A

Check book

40
Q

Symbols for switch lamp and resistor

A

Check book

41
Q

Symbols for bell ammeter and voltmeter

A

Check book

42
Q

Symbols for diode variable resistor thermistor LDR and buzzer

A

Check book

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