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Year 8 > Electricity and Magnetism ETT > Flashcards

Electricity and Magnetism ETT Flashcards

1
Q

What is the circuit symbol for an open switch?

A
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2
Q

What is the circuit symbol for a closed switch?

A
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3
Q

What is the circuit symbol for a cell?

A
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4
Q

What is the circuit symbol for a battery?

A
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5
Q

What is the circuit symbol for a resistor?

A
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6
Q

What is the circuit symbol for a variable resistor?

A
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7
Q

What is the circuit symbol for a lamp?

A
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8
Q

What is the circuit symbol for a fuse?

A
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9
Q

What is the circuit symbol for a voltmeter?

A
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10
Q

What is the circuit symbol for an ammeter?

A
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11
Q

What is current?

A

The rate of flow of charge

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12
Q

What type of circuit is shown in the image?

A

Series circuit

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13
Q

What equation links potential difference, current and voltage?

A

Potential difference = current x resistance

V = I R

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14
Q

For a given potential difference, what happens to the current when the resistance increases?

A

The current decreases.

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15
Q

What is the rule for current in a series circuit?

A

Current is the same everywhere in the circuit

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16
Q

What is the rule for potential difference in a series circuit?

A

Potential difference is shared between components.

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17
Q

Where should you place an ammeter to measure current through a component?

A

The ammeter should be placed in series with the component.

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18
Q

What is the rule for potential difference in a parallel circuit?

A

It is the same in each branch.

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19
Q

Where should you place a voltmeter to measure potential difference across a component?

A

The voltmeter should be placed parallel to the component.

20
Q

What is the total resistance of the three resistors in series?

A

25 Ω

21
Q

What is the rule for current in a parallel circuit?

A

Current is shared between the branches.

22
Q

Name the equipment used to measure potential difference.

A

Voltmeter

23
Q

What is meant by the term ‘resistance’?

A

How difficult it is for current to flow

24
Q

In a parallel circuit, what happens to the total resistance when you add a resistor?

A

The total resistance decreases.

25
Q

Name the equipment used to measure current.

A

Ammeter

26
Q

When two insulating materials are rubbed together, what charge will the material that gains electrons have?

A

Negative

27
Q

When certain insulating materials are rubbed together, what will be scraped off one and transferred onto the other?

A

Electrons

28
Q

What do like charges do?

A

Repel

29
Q

Name the force that causes a build up of static charge.

A

Friction

30
Q

When two insulating materials are rubbed together, what charge will the material that loses electrons have?

A

Positive

31
Q

Name the force exerted between charged objects.

A

Electrostatic

32
Q

What do opposite charges do?

A

Attract

33
Q

Name the three magnetic materials.

A
  • Iron
  • Cobalt
  • Nickel
34
Q

What happens when two ‘like’ poles are brought together?

A

They repel each other

35
Q

Is magnetism an example of a contact or non-contact force?

A

Non-contact force

36
Q

Draw the magnetic field lines around a bar magnet.

A
37
Q

What happens when two opposite poles are brought together?

A

They attract each other

38
Q

Complete the diagram to show the directions that the plotting compasses will point.

A
39
Q

Draw the magnetic field around an electromagnet.

A
40
Q

What happens when a current flows through a wire?

A

A magnetic field is produced

41
Q

Describe the magnetic field lines in the middle of an electromagnet.

A

Strong and uniform

42
Q

Give three ways in which you can increase the strength of an electromagnet.

A
  • Increase the voltage
  • Increase the number of coils on the wire
  • Use a soft iron core in the middle
43
Q

Give two advantages of an electromagnet over a permanent magnet?

A
  • You can turn an electromagnet on and off.
  • You can change the strength of the electromagnet
44
Q

What causes the Earth to have a magnetic field?

A

Liquid iron in the Earth’s core

45
Q

What two ways can be used to investigate magnetic field lines around a bar magnet?

A
  1. Sprinkle iron filings around the magnet
  2. Move a plotting compass around the magnet

Year 8 (12 decks)

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