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Generator PhET

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Generator PhET Introduction: Why was Hoover Dam (Boulder Dam) built eighty years ago? In 1936 the generators in the dam started transmitting power to Los Angeles and later generators were brought online to power oth ...

Generator PhET Introduction: Why was Hoover Dam (Boulder Dam) built eighty years ago? In 1936 the generators in the dam started transmitting power to Los Angeles and later generators were brought online to power other cities, including your hometown. When high-pressure water flows through the dam’s power plant, the water turns turbines in generators. A magnetic in the generator spins in the generator’s magnetic field. This moving-magnet-in-a-magnetic field causes electrons to move, eventually ending up in your TV, ipod, Wii, etc. Important Formulas: Procedure, Part I: • Begin with the “Bar Magnet.” Click “See Inside” and observe the magnetic domains in the magnet and the field those domains create. Draw a diagram of the bar magnet in the box. (Use the Shapes tool in Word.) Light Grey Dark Grey Red Half Red and Half Black S N What happens as the compass moves in the magnetic field? The direction changes when the compass moves in the magnet field. Part II: A Moving Magnet in a Magnetic Field (Pickup Coil) • What happens when a magnet moves through a coil in which electrons can move? When a magnet moves through a coil in which electrons can move it causes the light bulb to get brighter and brighter. • Investigate the brightness of the light (current) as the number of loops is changed, as the speed of the magnetic changes, the area of the wire coil is changed, and the polarity of the moving magnet is changed. Changing Speed of the magnet Results Light is not as bright Changing Area of the wire coil Results The direction changes to the North Changing Polarity Results The Direction of the Electron changes Changing Number of Loops Results Brighter Light Part III: Creating a Magnetic Field (Electromagnet) • Just like a changing magnetic field (from a magnet moving in a magnetic field) can cause electrons to move, moving electrons can create magnetic fields. • Investigate how the properties of an electromagnet affect the magnetic field created. Changing Higher Voltage Results Stronger Resultant Field Changing Greater Current Results Stronger Magnetic Field Changing Voltages Results Direction changes Changing No current Results Strength of magnetic field vary

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