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Transcript
Mrs. Brostrom Integrated Science C ELECTROMAGNETS OBJECTIVE: Describe the relationship between current and magnetism. WHAT IS MAGNETISM? Created by moving electric charges (electrons) Has north and south poles A compass aligns with Earth’s magnetic field What happens when the compass is brought near an electric current? Needle is deflected (moved) WHAT IS MAGNETISM? In magnetic materials like Iron (Fe): Caused by electrons moving around the nucleus Groups of atoms join together The magnetic field of each atom adds together to create a larger magnetic field ELECTROMAGNETS Electricity and magnetism are related Electric current in a wire creates a magnetic field The stronger the electric current, the stronger the magnetic field ELECTROMAGNETS A coil that has a soft iron core and that acts as a magnet when an electric current is in the coil is called an electromagnet. A coiled wire creates a greater magnetic field Each loop increases the magnetic field Called a solenoid Safer than increasing electric current ELECTROMAGNETS One use of electromagnets is doorbells ELECTROMAGNETS Scrap-metal cranes also use electromagnets ELECTROMAGNETS Loudspeakers are also electromagnets ELECTROMAGNETS House telephones are also electromagnets What type of energy transfer occurs with electromagnets? electromagnetic to electrical LET’S TRY IT OUT It’s time to build your own electromagnet
