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Entry Level - Component 6 - Electricity, magnetism, and waves > Component 6 > Flashcards

Component 6 Flashcards

1
Q

What is current?

A

Flow of electrical charge

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2
Q

What is current measured in (units)?

A

Amps

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3
Q

What is current measured with? (Equipment)

A

Ammeter

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4
Q

What is voltage measured in (units)?

A

Volts

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5
Q

What is voltage measured with?

A

A voltmeter

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6
Q

What can change the current?

A

Changing the resistance and the voltage

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7
Q

If you increase the resistance, what happens to current?

A

Decreases (Gets smaller)

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8
Q

What is resistance?

A

How difficult it is for electric current to pass through a component

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9
Q

What supplies current to a circuit?

A

Batteries and cells

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10
Q

What type of current do batteries provide?

A

Direct current (DC)

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11
Q

What type of current does mains electricity provide?

A

Alternating current (AC)

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12
Q

What voltage is UK mains electricity? (please give the unit)

A

230V

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13
Q

Why do you need a complete circuit?

A

For electric current to flow

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14
Q

What are the 3 types of wire in a plug?

A
  • live wire – brown
  • neutral wire – blue
  • earth wire – green and yellow
    stripes.
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15
Q

What is the brown wire in a plug?

A

Live wire

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16
Q

What is the blue wire in a plug?

A

Neutral wire

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17
Q

What is the green and yellow striped wire in a plug?

A

Earth wire

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18
Q

What does the earth wire in a plug do?

A

The earth wire is a safety wire
to stop the appliance becoming
live

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19
Q

What does the fuse in a plug do?

A

The fuse contains a thin
piece of wire, which melts if
the current becomes too large,
thereby cutting off the supply.

20
Q

Why wouldn’t a plug need an earth wire/fuse?

A

If it was double insulated

21
Q

What is the unit for energy?

A

Kilowatt hour (kWh)

22
Q

How is energy (kWh) calculated?

A

Power (kW) x time (h)

23
Q

How do magnets attract?

A

Opposite poles attract – this is a non-contact force

24
Q

How do magnets repel?

A

Like poles attract (if they are the same) – this is a non-contact force

25
Q

How is an electrical magnetic field produced?

A

When electricity passes through a conductive wire, a magnetic field is produced around the wire

26
Q

How can the strength of an electromagnet be increased?

A
  • Increase the current
  • More turns in the coil
  • Add an iron core
27
Q

What can electromagnets be used for?

A

Scrapyard cranes

28
Q

What are the two types of waves?

A

Transverse and longitudinal

29
Q

How do transverse waves move?

A

Oscillations are perpendicular (at a right angle) to the direction of energy transfer

30
Q

Give an example of a transverse wave

A

Ripple on a water surface

31
Q

How do longitudinal waves move?

A

Oscillations are parallel (same direction) to the direction of energy transfer. There are areas of compression and rarefaction

32
Q

Give an example of a longitudinal wave

A

Sound waves

33
Q

What is the amplitude of a wave?

A

How far up or down it goes

“The amplitude of a wave is the maximum
displacement of a point on a wave away
from its undisturbed position.”

34
Q

What is the wavelength of a wave?

A

The wavelength of a wave is the distance
from a point on one wave to the equivalent
point on the adjacent wave.

35
Q

What is the frequency of a wave?

A

The frequency of a wave is the number of
waves passing a point each second.

wave speed (m/s) = frequency (Hz) x
wavelength (m)
36
Q

Which type of wave are electromagnetic waves

A

Transverse wave

37
Q

What are the types of electromagnetic waves, from long to short wavelength?

A
  • radio
  • microwave
  • infrared
  • visible light (red to violet)
  • ultraviolet
  • X-rays
38
Q

Which electromagnetic spectrum radiations are dangerous to human tissue?

A

Ultraviolet waves, X-rays and gamma rays
can have hazardous effects on human
body tissue.

39
Q

What are radiowaves used for?

A

Television and radio

40
Q

What are microwaves used for?

A

Satellite communications,

cooking food

41
Q

What are infared rays used for?

A

Electrical heaters, cooking

food, infrared cameras

42
Q

What is visible light used for?

A

Fibre optic

43
Q

What is ultraviolet light used for?

A

Energy efficient lamps, sun

tanning

44
Q

What are X-rays used for?

A

Medical imaging and

treatments

45
Q

What are gamma rays used for?

A

Sterilising

Entry Level - Component 6 - Electricity, magnetism, and waves (1 decks)

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