Magnetism and Electricity SPI 0807.12.1 & .2 Magnetism and Electricity

BELL WORK Put any work you have for me in the basket with your name on it. Describe (name and reactivity) the following groups/families of elements (try without looking at your notes): Group 1 Group 2 Groups 3-12 Group 17 Group 18

Objectives: 1. Recognize that electricity can be produced by using a magnet and a wire coil.

Brainpop: Electromagnetic Induction What is the relationship between electricity and magnetism?

Producing Electricity with Magnetism An electric current can be produced when moving a bar magnet through a coil of copper wire. Electric current can also make a magnet! Electricity and magnetism have an impact on each force.

Measuring Electricity Microammeter is an instrument used to measure small electrical currents.

What is a generator? An electric generator is a device that uses magnetism to produce electricity.

Objective: Describe the basic principles of an electromagnet. Lets watch a brainpop and look at some visuals.

What is an electromagnet? An electromagnet is simply a coil of wire wrapped around an iron core connected to an electric current producing a magnetic field.   

Strength of Magnetic Field PERMANENT MAGNET FIXED STRENGTH ELECTROMAGNET  STRENGTH CAN BE CHANGED Talk to your neighbor about things you might do to increase the strength of this electromagnet?

Strength of Electromagnet 2 ways to increase the strength of an electromagnet: 1) increase the number of loops around the core. 2) increase the electric current (stronger battery)

How do you turn it off? The electromagnet will best function as a magnet as long as an electric current flows through the wire.

Objectives: 1. Recognize that electricity can be produced by using a magnet and a wire coil. 2. Describe the basic principles of an electromagnet.

1 The diagram shows a device made up of a battery, some wire, and an iron core. Which type of device is shown? F. An electric generator G. A generator H. a bar magnet J. An electromagnet

2 Which machine uses magnetism to produce electricity? A. electromagnet B. electric generator C. balance D. compass

3. Which diagram best identifies how an electric current is produced?

4 In an electromagnet, a current is passed through loops of wire that surround a core. Which material would be best to use as the core of an electromagnet? A. a pencil B. a pen C . a piece of chalk D. a steel screw

5. A student coils a copper wire around a bar magnet. Which action will cause the device to generate electricity? A. The student connects the copper wire to a light bulb. B. The student insulates the copper wire with plastic. C. The student uses a horseshoe magnet instead of a bar magnet. D. The student moves the bar magnet through the copper wire coils.

6. Which objects would you combine to build an electromagnet? A. compass, source of electric current, copper wire B. battery, generator, steel screw C. copper wire, source of electric current, steel screw D. battery, light bulb, plastic straw

7. What will happen if a bar magnet is moved through a coil of wire? A. The bar magnet will lose its magnetism. B. An electric current will be generated in the wire. C. The wire will become an electromagnet. D. An electric current will be generated in the magnet.

8. Which diagram represents a magnet creating an electric current?

9. Which diagram best represents the lines of the magnetic field that pass through Points 1 and 2 of the electromagnet?

10. Which statement best compares a permanent magnet and an electromagnet? A. A permanent magnet has a north pole and a south pole, but an electromagnet only has a south pole. B. A permanent magnet has a fixed magnetic field strength but the magnetic field strength of an electromagnet can be changed. C. A permanent magnet requires an external source of energy, but an electromagnet produces its own energy. D. The magnetic field lines from a permanent magnet emerge from the north pole, but they emerge from the south pole of the electromagnet.

Bell work Grab a study guide from the front table. Make sure you have your argumentative essay packet. You will have time to work on these today after the practice test. Get out a sheet of paper and number 1-26. (title it “Magnetism Practice Test”) START WORKING ON YOUR STUDY GUIDE. IF YOU HAVE HEADPHONES GO GET THEM NOW OR FOREVER HOLD YOUR PEACE.

MAGNETISM TEST SPI 0807.12.1 Recognize that electricity can be produced using a magnet and wire coil. SPI 0807.12.2 Describe the basic principles of an electromagnet. SPI 0807.12.3 Distinguish among the Earth’s magnetic field, a magnet, and the fields that surround a magnet and an electromagnet.