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Physics > Year 8 Electricity > Flashcards

Year 8 Electricity Flashcards

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1
Q

What flows in an electronic current

A

Electrons

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2
Q

What a the flow of electrons called

A

A current

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3
Q

What is the voltage

A

The size of the ‘push’ provided by a cell

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4
Q

What device measures current

A

Ammeter

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5
Q

What is the unit used for a current

A

Amperes (A)

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6
Q

What does a voltmeter measure?

A

Potential difference

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7
Q

What unit is used to measure potential difference?

A

Volts (V)

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8
Q

True/false. In a series circuit the current is the same at any point in the circuit.

A

True

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9
Q

What is a conventional current?

A

This is where the electrons are pushed away from the negative terminal of the cell.

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10
Q

What is a series circuit?

A

This is where everything is placed on a loop from negative to positive terminal

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11
Q

What is a parallel circuit?

A

A circuit that contains more than on possible path for the current to flow round.

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12
Q

What is resistance?

A

Conductors have low resistance and insulators have high resistance, this is how much the material will try to stop the electrons from flowing through them.

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13
Q

What is resistance measured in?

A

Ohms (Ω)

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14
Q

What symbol does current have?

A

I

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15
Q

What symbol does resistance have?

A

R

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16
Q

What symbol does potential difference have?

A

V

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17
Q

What is a diode?

A

Something that allows a current to flow in one direction

18
Q

What does a rheostat do?

A

Changes the amount of current flowing through a circuit.

19
Q

What happens in an AND gate?

A

Both switches must be on to get an output

20
Q

What is the calculation to calculate resistance?

A

R=V/I

21
Q

What does ‘DC’ stand for?

A

Direct current ( electrons only flow in one direction)

22
Q

What does ‘AC’ stand for?

A

Alternating Current ( this current changes direction at a regular rate )

23
Q

In power lines, how is electricity transported as?

A

AC / alternating current

24
Q

How many volts are in a normal wall plug?

A

230V

25
Q

What happens during a short circuit?

A

The live and neutral wire cross causing a large current.

26
Q

How does a fuse protect you?

A

It melts when there is a short circuit and breaks the circuit

27
Q

When are ‘Earth’ wires used?

A

If an appliance has a metal case

28
Q

What is the definition of power?

A

The rate at which energy is transfered

29
Q

What is power measured in?

A

Watts ( W )

30
Q

What is the calculation for Power?

A

Power = Voltage x Current

31
Q

How can a charged body be discharged?

A

By connecting it to earth with a conductor

32
Q

How does lightning happen?

A

It happens when clouds discharge through the air

33
Q

What happens when you rub a balloon on your head?

A

The negatively charged electrons are “ rubbed off “ onto your hair. Your hair becomes negatively charged.

34
Q

What happens when to bodies that carry the same type of charge come together?

A

They repel

35
Q

What happens when to bodies that carry opposite charges come together?

A

They attract

36
Q

True / False. Charged objects attract small objects like dust particles.

A

True

37
Q

Which 3 metals are attracted to a magnet?

A

1) Iron ( and steel which is over 90% Iron)
2) nickel
3) cobalt

38
Q

Where is the magnetism of a magnet concentrated?

A

The poles ( north and south)

39
Q

Fact! Two opposite poles attract each other.

A
40
Q

What is a magnetic field?

A

The area around a magnet where it has magnetic effect.

41
Q

Rules about magnetic fields.

A

1) the field lines point from north poles to south poles.
2) the field lines never cross
3) where the lines are close together the field is strong and where the lines are further apart, the field is weaker.

Physics (3 decks)

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