Unit 6.4

Question 1

Direct current (DC)

Answer 1

Current generated by electrons always moving in one direction

Question 2

Electromagnet

Answer 2

A solenoid with an iron rod in its centre

Question 3

Electromagnetism

Answer 3

The relationship between electricity and magnetism

Question 4

Field lines

Answer 4

Lines that show the direction of the force on iron filings and compass needles

Question 5

Generator

Answer 5

Uses electromagnetism to produce electricity; needs a spinning coil and a magnet

Question 6

Magnetic field

Answer 6

An invisible force field around a magnet

Question 7

Motor

Answer 7

A machine that uses electromagnetism to spin; it needs a current-carrying coil and a magnet

Question 8

Solenoid

Answer 8

A current-carrying loop of wire

Question 9

Transformer

Answer 9

A device that increases or decreases voltage

Question 10

Turbine

Answer 10

A large-scale electricity generator

Question 11

Alternating current (AC)

Answer 11

Current generated by electrons changing the direction in which they move