Investigation Three: Electromagnets, Generators, and telegraphs Book one: energy Investigation Three: Electromagnets, Generators, and telegraphs

Focus questions How can we create an electromagnet? How can we make an electromagnet stronger? How can we make a telegraph?

Get your Plicker’s answer pages ready! Review! Review! Review! Get your Plicker’s answer pages ready!

Crane Problem

1. Electromagnet - A piece of iron that becomes a temporary magnet when electricity flows through a wire

A property of electric and magnetic fields that causes interactions 2. Electromagnetism - A property of electric and magnetic fields that causes interactions

3. coil - A series of loops

The material around which a coil of insulated wire is wound. 4. Core - The material around which a coil of insulated wire is wound.

Electromagnet Coils Core

A device that produces electricity from magnets. 5. Generator - A device that produces electricity from magnets.

What do we use generators for?

6. Telegraph - A device that uses electromagnets to send coded messages by opening and closing a circuit.

History of the Telegraph

A quick back-and-forth movement 7. Vibration - A quick back-and-forth movement

The switch that completes the circuit in a telegraph system. 8. Key - The switch that completes the circuit in a telegraph system.

The speed in which something moves. 9. Frequency - The speed in which something moves.

A set of signals that represent letters or words for sending messages. 10. code - A set of signals that represent letters or words for sending messages.

Code Methods Grid Code Morse Code

Electromagnets and Generators Experiments! Mrs. Smith’s Room Mr. Croft’s Room Electromagnets and Generators Telegraph Messaging

Focus questions How can we create an electromagnet? How can we make an electromagnet stronger? How can we make a telegraph?