# Electromagnetism.

## Presentation on theme: "Electromagnetism."— Presentation transcript:

Electromagnetism

Student Instruction 1 Before you begin reading the ‘Electricity’ notes, make an inside fold in your science notebook and write the title ‘Electromagnets’ . Make sure you update your Table of Contents and page numbers. Now copy the Objective and Essential Question. Be sure to complete all of the Student Instructions, when prompted, in your notebook.

Electromagnetism Objective:
After hands on exploration, students will identify, classify, and document the characteristics of an electromagnet by the end of the lesson.

How do you make an electromagnet?
Electromagnetism Essential Question: How do you make an electromagnet?

Hans Christian Orested
Hans Christian Oersted was a Danish physicist who discovered the connection between electricity and magnetism. On April 21, 1820, the 42 years old Oersted demonstrated his famous experiment, where he passed electric current through a wire, which caused a nearby magnetic compass needle to move. His discovery is called Electromagnetism

Electromagnetism When electric current flows through a wire, a magnetic field is created all around the wire. This will cause the wire to behave like a magnet and attract objects made out of iron, steel, nickel or cobalt .

Building an Electromagnet
To build an simple series electromagnet, you need a battery (source ), a long insulated thin wire (path), and an iron nail or rivet (receiver). Wrap the wire tightly around the nail or rivet, leaving enough wire at both ends to attach to the battery. Once the wire is attached to the battery, the nail/rivet becomes a temporary magnet.

Student Instruction 2 Student Instruction 3
Draw an illustration (on a separate ½ piece of unlined paper), of a simple series electromagnet with 1 source, 1 path, 1 switch and 1 rivet . Be sure to include captions of the relevant parts. Student Instruction 3 Draw a schematic (on a separate ½ piece of unlined paper), of a simple series electromagnet with 1 source, 1 path, 1 switch and 1 rivet . Be sure to include a key.

Temporary Magnet The electro magnet becomes a temporary magnet. The core (rivet) will retain its magnetic force as long as the current flows through the circuit. If the circuit is disconnected or switched off, the magnetic field ends. Closed switch Open switch

Michael Faraday Michael Faraday was an English scientist most famous for his discovery of Electromagnetic Induction.

Student Instruction 4 Student Instruction 5
Write 3 facts not mentioned in the notes about Hans Christian Oersted. Also get a picture of him for your note book. Student Instruction 5 Write 3 facts not mentioned in the notes about Michael Faraday. Also get a picture of him for your note book.

Electromagnetic Induction
In 1831, Michael Faraday conducted an experiment that proved that electric current could be produced from magnets by pushing a magnet through a coil of wire. This is called Electromagnetic Induction. Induction comes from the word Induce, which means to bring about or cause; not spontaneous.

Electromagnetic Induction Continued
Faraday also discovered that the tightness of the coil and the speed that the magnet moves affect the strength of the electromagnet. The tighter the coil and the faster the magnet moves both make the electric current stronger.

Electromagnetism Electromagnets are everywhere. We use them when we ring a door bell, turn on a television and blow-dry our hair. They can be found in most household appliances. They are also used in industrial machines to move or lift heavy objects. What may surprise some people is that electromagnetism is people. It is what holds our atoms together.

Student Instruction 6 Student Instruction 7
Use a simple series circuit first, then an advance series circuit to see if the number of sources affects the strength of the electromagnet. Record your results. Student Instruction 7 Conduct an experiment to see if the tightness of the coil affects the strength of the electromagnet. Use an advance series circuit and record your results.

Resources www.famousscientists.org/hans-christian-oersted/
https://app.discoveryeducation.com (Electromagnets) https://app.discoveryeducation.com (Electricity from Magnets) FOSS Science Stories: Magnetism and Electricity