Component 6

Question 1

What is current?

Answer 1

Flow of electrical charge

Question 2

What is current measured in (units)?

Answer 2

Amps

Question 3

What is current measured with? (Equipment)

Answer 3

Ammeter

Question 4

What is voltage measured in (units)?

Answer 4

Volts

Question 5

What is voltage measured with?

Answer 5

A voltmeter

Question 6

What can change the current?

Answer 6

Changing the resistance and the voltage

Question 7

If you increase the resistance, what happens to current?

Answer 7

Decreases (Gets smaller)

Question 8

What is resistance?

Answer 8

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

Question 9

What supplies current to a circuit?

Answer 9

Batteries and cells

Question 10

What type of current do batteries provide?

Answer 10

Direct current (DC)

Question 11

What type of current does mains electricity provide?

Answer 11

Alternating current (AC)

Question 12

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

Answer 12

230V

Question 13

Why do you need a complete circuit?

Answer 13

For electric current to flow

Question 14

What are the 3 types of wire in a plug?

Answer 14

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

Question 15

What is the brown wire in a plug?

Answer 15

Live wire

Question 16

What is the blue wire in a plug?

Answer 16

Neutral wire

Question 17

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

Answer 17

Earth wire

Question 18

What does the earth wire in a plug do?

Answer 18

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

Question 19

What does the fuse in a plug do?

Answer 19

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

Question 20

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

Answer 20

If it was double insulated

Question 21

What is the unit for energy?

Answer 21

Kilowatt hour (kWh)

Question 22

How is energy (kWh) calculated?

Answer 22

Power (kW) x time (h)

Question 23

How do magnets attract?

Answer 23

Opposite poles attract – this is a non-contact force

Question 24

How do magnets repel?

Answer 24

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

Question 25

How is an electrical magnetic field produced?

Answer 25

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

Question 26

How can the strength of an electromagnet be increased?

Answer 26

- Increase the current - More turns in the coil - Add an iron core

Question 27

What can electromagnets be used for?

Answer 27

Scrapyard cranes

Question 28

What are the two types of waves?

Answer 28

Transverse and longitudinal

Question 29

How do transverse waves move?

Answer 29

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

Question 30

Give an example of a transverse wave

Answer 30

Ripple on a water surface

Question 31

How do longitudinal waves move?

Answer 31

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

Question 32

Give an example of a longitudinal wave

Answer 32

Sound waves

Question 33

What is the amplitude of a wave?

Answer 33

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.”

Question 34

What is the wavelength of a wave?

Answer 34

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

Question 35

What is the frequency of a wave?

Answer 35

The frequency of a wave is the number of waves passing a point each second. ``` wave speed (m/s) = frequency (Hz) x wavelength (m) ```

Question 36

Which type of wave are electromagnetic waves

Answer 36

Transverse wave

Question 37

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

Answer 37

- radio - microwave - infrared - visible light (red to violet) - ultraviolet - X-rays

Question 38

Which electromagnetic spectrum radiations are dangerous to human tissue?

Answer 38

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

Question 39

What are radiowaves used for?

Answer 39

Television and radio

Question 40

What are microwaves used for?

Answer 40

Satellite communications, | cooking food

Question 41

What are infared rays used for?

Answer 41

Electrical heaters, cooking | food, infrared cameras

Question 42

What is visible light used for?

Answer 42

Fibre optic

Question 43

What is ultraviolet light used for?

Answer 43

Energy efficient lamps, sun | tanning

Question 44

What are X-rays used for?

Answer 44

Medical imaging and | treatments

Question 45

What are gamma rays used for?

Answer 45

Sterilising