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CURRENT MAGNET MAGNET CURRENT What Causes Magnetic Fields? a. b. When there is no current in the wire, the compasses align with Earth’s magnetic field. When there is a current in the wire, the compasses shift and align around the wire! What Causes Magnetic Fields? a. b. When there is no current in the wire, the compasses align with Earth’s magnetic field. When there is a current in the wire, the compasses shift and align around A magnetic fieldtheiswire! produced by the motion of electric charges (current). No magnetic field… No magnetic field… A moving charge creates a magnetic field. Making an Electromagnet If the wire is bent into a loop, the magnetic field lines become bunched up inside the loop. A current-carrying coil of wire is called an electromagnet. A piece of un-magnetized iron placed inside the coil will act as a magnet when current goes through the coil. Making an Electromagnet If the wire is bent into a loop, the magnetic field lines become bunched up inside the loop. A current-carrying coil of wire is called an electromagnet. A piece of un-magnetized iron placed inside the coil will act as a magnet when current goes through the coil. Making an Electromagnet If the wire is bent into a loop, the magnetic field lines become bunched up inside the loop. A current-carrying coil of wire is called an electromagnet. A piece of un-magnetized iron placed inside the coil will act as a magnet when current goes through the coil. WHAT IS ELECTROMAGNETIC INDUCTION? What is Electromagnetic Induction? Movement of electric charges (current) creates or “induces” a magnetic field. Likewise, a changing magnetic field through a coil can induce a current in a coil. This phenomenon is called electromagnetic induction (EMI). What is Electromagnetic Induction? If you rotate a magnet efficiently, electric current can be generated in large quantities! EMI in a Power Plant Renewable sources include: hydroelectric, wind generators, solar energy, and tidal power. Other forms include petroleum and geothermal sources. Renewable sources include: hydroelectric, wind generators, solar energy, and tidal power. Virtual Tour – Coal Power Plant https://youtu.be/xokHLFE96h8?t=30s Other EMI Applications Other EMI Applications Circuit Breakers • Circuit breakers are common in most households in America. • A circuit breaker will detect when the current is too high, which could happen because: Too many appliances are plugged in, causing a small resistance to the current • When the current increases, the internal electromagnet pulls the circuit loose. Circuit Breakers • Circuit breakers are common in most households in America. • A circuit breaker will detect when the current is too high, which could happen because: Too many appliances are plugged in, causing a small resistance to the current • When the current increases, the internal electromagnet pulls the circuit loose. Circuit Breakers • Circuit breakers are common in most households in America. • A circuit breaker will detect when the current is too high, which could happen because: Too many appliances are plugged in, causing a small resistance to the current • When the current increases, the internal electromagnet pulls the circuit loose. Other EMI Applications EMI BBQ: http://youtu.be/txmKr69jGBk EMI Cooking: https://youtu.be/Gdb1VBwScPU Julius Sumner Miller Lesson 40 - Adventures in Magnetism: https://youtu.be/8DDw9olY0c8 Lesson 41 – “Producing” Electricity: https://youtu.be/IsdgpJ_ELr8 Lesson 42 – Effects of Electric Current: https://youtu.be/MSVR2Xpc6fs Lesson 44 - More adventures in electromagnetism: https://youtu.be/cUVJkeLvBcc
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