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Science Yr 8 Summer Exam Revision > Electricity and Circuits > Flashcards

Electricity and Circuits Flashcards

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1
Q

what are delocalised electrons

A

free to move negatively charged electrons

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2
Q

what is the symbol that represents charge

A

Q

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3
Q

unit for charge?

A

Coulombs

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4
Q

how do you represent a Coulomb of charge (letter)

A

C

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5
Q

what does it mean if there is 1 Coulomb of charge per second

A

there is 1 Amp

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6
Q

what does one mean by a Coulomb in general

A

millions and millions of electrons

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7
Q

current- defenition

A

the rate of flow of charge

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8
Q

what is the unit for current (+ letter)

A

Amps (A)

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9
Q

what is current represented by (the letter)

A

I

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10
Q

how does one measure current

A

ammeter

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11
Q

how is an ammeter connected in a circuit

A

in series

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12
Q

what is potential difference

A

the amount of energy transferred per Coulomb of charge

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13
Q

what is the symbol: potential difference

A

V

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14
Q

potential difference- unit

A

Volts (V)

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15
Q

what is 1V equal to

A

1V = 1J/C

1 Volt = 1 Joule/ Coulomb of charge

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16
Q

how does one measure voltage

A

voltmeter

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17
Q

how is a voltmeter connected to a circuit

A

in parallel

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18
Q

why is a voltmeter connected in parallel (2)

A

1) it needs to measure across not through

2) it has a high resistance and would consume the current and not be able to measure the PD effectively

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19
Q

describe how to draw an open light switch symbol (4)

A
  • leave gap
  • colour circle
  • draw a line leading upwards
  • unconnected, colour other circle
20
Q

describe how to draw a closed light switch symbol (4)

A
  • leave gap
  • colour circle
  • colour other circle
  • draw line leading from the bottom of circle 1 to the top of circle 2 so that it is connected
21
Q

describe how to draw a light bulb (3)

A
  • leave a gap
  • draw a circle
  • draw a cross through it
22
Q

describe how to draw a battery (6)

A
  • draw long line for positive
  • short line for negative
  • dash connecting short and long lines
  • draw second positive
  • draw second negative
  • draw second dash connected to the wire
23
Q

describe how to draw a cell (3)

A
  • draw long line for positive
  • draw short line for negative
  • connect it to the wire using two dashes from the outer side of each line
24
Q

describe how to draw an ammeter

A
  • leave a gap
  • draw a circle
  • write a capital A inside
25
Q

describe how to draw a voltmeter

A
  • find a component
  • draw a line coming out on its left
  • draw half a line towards the direction at a 90 degree angle facing from it
  • draw a circle
  • draw another half line mirroring the first
  • connect the second half line to the wire
  • write a capital V in the circle
26
Q

what happens if 2 positives or 2 negatives in a battery are next to one-another

A

current will not flow

27
Q

‘in series’ definition

A

current has and flows along one path only

28
Q

‘in parallel’ definition

A

current splits off into two or more branches before recombining

29
Q

describe current in a series circuit

A

the same at every point

30
Q

describe current in a parallel circuit

A

splits/ joins up at junctions (nodes)

31
Q

what are nodes?

A

junctions where current meets or splits up in a parallel circuit

32
Q

what is a conductor

A

allows heat and/ OR electricity to pass through easily

33
Q

what is an insulator

A

heat or electricity cannot pass through it easily

34
Q

example of an electrical conductor

A

copper (wires)

35
Q

example of an electrical insulator

A

paint

36
Q

what is resistance?

A

the opposition of current

37
Q

what happens when resistance occurs

A

delocalised electrons collide with positive metal ions in conductors

38
Q

what happens to current in the presence of a high resistance

A

high resistance = low current

39
Q

symbol for resistance

A

R

40
Q

unit for resistance

A

Ohms

41
Q

what do we represent Ohms by

A

Ω

42
Q

describe 3 subsequent effects of high resistance

A

1) high resistance —–
2) high potential difference —–
3) more collisions —-
4) more energy transferred per Coulomb of charge

43
Q

describe 2 subsequent effects of a long wire

A

1) long wire —-
2) more collisions —-
3) higher resistance —-

44
Q

equation for working out charge

A

Q = I x T

45
Q

equation for working out electricty

A

E = Q x V

46
Q

equation for potential difference

A

V = I x R

Science Yr 8 Summer Exam Revision (10 decks)

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