Why was Hoover Dam (Boulder Dam) built eighty years ago? In 1936 the generators
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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 gencrators 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 gen rators. Amagnd in tbc gcnator spins the generator's magnetic field. This electrons to move, eventually ending up your TV, ipod·Wii, dc. field causes Generate Important Formulas: IF sqvx8||r_-a_/f Procedure, Part I: PhET SimulationsPlay With SimsElectricity, Magnets and Crcuits Generator Re Now . 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 Move the compass around the magnet. What happens as the compass moves in the magnetic field? Single magnet's field Part II: A Moving Ma in a M Field What happens when a magnet moves through a coil in which electrons can move? 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. Results Results t Il: Cre Ma Field Just like a changing magnetic field (from a magnet moving in a magnctic field) can cause electrons to move, moving electrons can create magnetic fields Investigate how the properties of an electromagnct affect the magnctic ficld crcatod Results Results Part IV: More Than Meets the E In a transformer, moving electrons in one coil create a magnetic field. When the created magnetic field interacts with a second coil, electrons can he forced to move in the second coil. Since the primary coil has four loops and the secondary coil has 1 to 3 loops, this is a step down transformer Since P-when voltage in a transformer decreases, current increases by the same amount and power in the transformer is constant Investigate how the properties of a transformer's secondary coil affect the current in the secondary coil. Results Results Move the primary coil in and out of the secondary coil . Change the primary coil to AC. What happans? With a DC primary coil, move the voltage slider back and forth. What happened?Explanation / Answer
(I) What happens as the compass moves in the magnetic field?
The direction changes when the compass moves in the magnet field.
(II) 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
(III) 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
(IV) Investigate how the properties of a transformer’s secondary coil affect the current in the secondary coil.
Changing: Number of Loops in the Secondary Coil
Results: Electrons move faster as number of Loops increase
Changing: Decrease voltage
Results: Electrons move slower
Changing: Increase Voltage
Results: Electrons move faster
Changin:g Voltage
Results: Light begins to shine
Move the primary coil in and out of the secondary coil. • Change the primary coil to AC. What happens?
When you change the primary coil to AC, the magnetic field begins to blink; when you move the primary coil in and out of the secondary coil it causes the light to shine bright.
With a DC primary coil, move the voltage slider back and forth. What happened?
No change.
Hope this helps :)
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