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Magnets Guided Notes Magnets Know that magnetism is the force of ________________ _____ __________________of magnetic materials. Surrounding a magnet is a magnetic field that____________ ______ ____________ , a push or pull, without actually touching an object. Evidence of a magnetic field can be found in how the field affects magnetic materials (including, but not limited to, a compass, iron filings, and paper clips). An electric current flowing through a ___________ ____________ around an _________core forms a magnet. A coil of wire spinning around a magnet or a magnet spinning around a coil of wire can form an ___________ _________________ Electricity and Magnets Examples of how magnetism and electricity are interrelated can be demonstrated by the following devices: Electromagnets Generators Simple Electric Motors Electromagnets An ______________________ is formed when a wire in an electric circuit is wrapped around an iron core producing a________________ _________________. The magnet that results loses its magnetism if the electric current ______________ _________________ Generators A generator produces an electric current when a coil of wire wrapped around an iron core is rotated _____________ __________________ Generators at power plants produce electric energy for our homes. A generator contains coils of wire that are _________________ , and ___________________ ______________________ are rotated by turbines. _________________ are huge wheels that rotate when pushed by water, wind, or steam. Thus mechanical energy is changed to electrical energy by a generator. Smaller generators may be powered by gasoline. Simple Electric Motors An _______________ ______________ changes electrical energy to mechanical energy. It contains an electromagnet that rotates between the poles of a magnet. The coil of the electromagnet is connected to a _________________ or other source of electric current. When an electric current flows through the wire in the electromagnet, a ____________________ ____________________ is produced in the coil. Like poles of the magnets _____________ and unlike poles of the magnets _________________ This causes the coil to rotate and thus changes electrical energy to mechanical energy. This rotating coil of wire can be attached to a shaft and a blade in an electric fan.