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Physics > circuits > Flashcards

circuits Flashcards

1
Q

draw a resistor

A
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2
Q

drawa thermistor

A
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3
Q

draw a variable resistor

A
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4
Q

draw a fuse

A
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5
Q

draw a ldr

A
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6
Q

draw a voltmeter

A
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7
Q

draw a ammeter

A
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8
Q

draw a light emmiting diode

A
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9
Q

draw a diode

A
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10
Q

draw a lamp

A
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11
Q

draw a cell

A
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12
Q

draw a battery

A
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13
Q

draw a switch

A
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14
Q

what does a n ammeter do

A

measures current

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15
Q

role of diode

A

controls direction of current

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16
Q

role of led

A

emmits light when current flows

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17
Q

role of resistor

A

affects size of current

18
Q

role of ldr

A

lowers resistance in bright light

19
Q

role of variable resistor

A

allows current to be varied

20
Q

role of fuse

A

melts when current is too high

21
Q

thermistor

A

lowers current when temperature is high

22
Q

current in series circuit

A

the same through all components

23
Q

current in parralel circuit

A

total current is the sum of each components current

24
Q

p.d in series

A

p.d is shared between all components

25
Q

p.d in parralel

A

the same through all components

26
Q

resistance in series

A

total resistance is the sum of every components resistance

27
Q

resistance in parallel

A

total resistance is less than value of smallest individual resistor

28
Q

is mains supply ac or dc

A

ac

29
Q

ac

A

current that repeatedly changes direction helps to maintain power and

30
Q

dc

A

current that only flows in one direction

31
Q

3 pin plug

A
  • outside is mae of insulating plastic and pins are made from copper alloy
32
Q

live wire

A
  • brown
  • goes on bottom right (br -brown)
  • carries alternating p.d from mains supply
  • p.d 230 v
33
Q

neutral

A
  • blue
  • bottom left (bl- blue)
    -completes the cicuit
  • p.d 0v
34
Q

earth wire

A
  • green and yellow
  • safety wire to stop appliance from becoming live if live wire touches metal casing
  • middle
  • p.d0v
35
Q

the national grid

A

series of cables and trasformers linking power stations to domestic customers

36
Q

componants of ng

A
  • power station
  • step up transfomer - inc p.d - less power lost
  • step down transformer - dec p.d - safe for consumors
37
Q

electric field lines

A

show direction + charge would move

38
Q

alpha

A
  • very ionising
  • not very penetrating
  • can be stopped by paper
  • loses 2 protons and 2 neutrons ( mass 4 proton 2))
39
Q

beta

A
  • less ionising
  • more penetrating
  • stopped by aluminium foil
  • fast moving electron
40
Q

gamma

A
  • not a particle
  • even less ionising
  • even more penetrating
  • stopped by thick lead
    -electromagnetic wave emmitted

Physics (7 decks)

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