Electromagnets Success criteria List some uses of an

Electromagnets Success criteriaü List some uses of an electromagnet. ü Describe the advantages of using electromagnets in comparison to permanent magnets. ü Describe and record observations and evidence systematically.

1. Draw the circuit symbols to show an electromagnet. 2. How do we make an electromagnet? 3. Why are electromagnets useful? 4. Why doesn’t a bell keep ringing? 5. How can we compare how strong an electromagnet is? 6. Why do we use electromagnets in electric showers?

The shape of a magnetic field can be shown by drawing magnetic field lines. These always point from the north pole of a magnet to the south pole, along the direction of the magnetic forces in each region. Where is the magnetic field strongest? strongest field at poles The closer together the magnetic field lines, the stronger the magnetic field. weakest field further away from poles

Task 2 Note

A large electromagnet is used on a recycling plant conveyor belt to pick up and move metal cans. Which metals would the electromagnet attract? What advantages does an electromagnet have over a permanent magnet?

The circuit for a door bell includes an electromagnet. When the circuit is closed, the electromagnet pulls the armature towards it, causing the hammer to strike the bell. The movement of the armature breaks the circuit, and the hammer returns to its original position. This sequence repeats, causing the bell to sound continuously.

Lifts, cars and other large electrical machines use high currents. Relays use an electromagnet to allow a small current in one circuit to control a large current in another circuit. Can you predict what will happen when the switch is closed in this circuit?

Task 3 - Videoclip

Task 4 -

Electromagnets Success criteriaü List some uses of an electromagnet. ü Describe the advantages of using electromagnets in comparison to permanent magnets. ü Describe and record observations and evidence systematically.