Electromagnets

Question 1

What is an electromagnet

Answer 1

A coil of wire with current going through it

Question 2

Describe three ways to make an electromagnet stronger

Answer 2

1. More current
2. More turns of the wire
3. An iron core

Question 3

Give three examples of electromagnet

Answer 3

Scrap heap, shower, speaker, alarm, anti shoplifting device, Maglev train

Question 4

What is a relay

Answer 4

Relays are to circuits where turning on one circuit also turns on the other

Question 5

How can relays be more safe than usual circuits

Answer 5

Because if you have a high volt. circuit and a low volt. circuit, the user only has to come into contact with try low volt. circuit