Essential Question How can electricity and mechanical energy

Essential Question: How can electricity and mechanical energy be transformed? Key Concept: Electrical energy is used everyday in our homes, business, and industries. Mechanical energy can be converted to electrical energy and vise versa.

Key Definitions: 1. Magnetism - force of attraction or repulsion of magnetic materials - opposite attract and likes repel 2. Magnetic Field - field surrounding a magnet that pushes or pulls on objects. 3. Electrical Current - flow of charged particles

Other Types of magnets: An electric current flowing through a wire wrapped around an iron core forms a magnet A coil of wire spinning around a magnet or magnet spinning around a wire can form an electrical current.

3 devices that use these concepts: 1. Electromagnets 2. Generators 3. Electric motors **Remember energy is never create - so it must be transformed.

Electromagnet - Wire in an electric circuit is wrapped around an iron core producing a magnet field. - In order to have a magnetic field there has to be a current flowing

Generators - coil of wire wrapped around an iron core is rotated near a magnet - used at power plants * coil of wire are stationary and magnets rotate around by turbines. - Mechanical energy of turbine turns into electrical energy in the generator.

Electric Motors - Does the opposite of a generator - Changes electrical to mechanical - An electromagnet rotates between the poles of a magnet - Coil of the electromagnet is connected to a battery source of electrical energy - When an electrical current flows through the wire in the electromagnet a magnetic field is produced. - Since poles of magnets repel and attract this causes the coil to rotate thus changing electrical to mechanical energy. - This rotating coil can be attached to a shaft/blade in a fan.

Difference between a generator and an electric motor: A generator converts mechanical to electrical. An electric motor converts electrical to mechanical. Both have a coil spinning inside of a magnet. It just depends on what energy source is spinning the coil. Ask yourself: Is it a turbine or a battery/outlet?

Electric Motor Generator

Summary: 1. What does magnetism and electrical currents have to do with an electromagnet? 2. How is electrical energy converted to mechanical energy? 3. How is mechanical energy converted to electrical energy? http: //www. youtube. com/watch? v=d_a. TC 0 i. KO 68