shake flashlight
DESCRIPTION
Shake Flashlight. North Dakota State College of Science Applied Science and Technologies. www.NDSCSnano.com. Electrical Basics. Current is the flow of electrons Voltage is electrical pressure Resistance is the opposition to the flow of electrons - PowerPoint PPT PresentationTRANSCRIPT
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Shake Flashlight
North Dakota State College of ScienceApplied Science and Technologies
www.NDSCSnano.com
www.NDSCSnano.com
Electrical Basics
• Current is the flow of electrons• Voltage is electrical pressure• Resistance is the opposition to the flow of
electrons• Ohm’s Law: V = I x R (voltage = current x
resistance)
Closed CircuitClosed Circuit
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Basic Electrical Principle
A magnetic field is generated around a wire as current flows through it. http://www.educypedia.be/electronics/javaelectricity.htm
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Shake Flashlight
The basic principle of "moving magnet plus coil makes electricity" is the foundation for electrical generators, so in a sense this is old technology.
http://www.msscweb.org
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Voltage Generation
When a magnet passes through a tightly-wound coil of insulated wire, a voltage is generated. As the magnet changes direction, so does the polarity of the voltage. This action generates an AC voltage.
http://www.msscweb.org
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Schematic
The AC voltage is sent to a full-wave bridge to convert the AC to a pulsating DC voltage. This energy is stored in Capacitor C1. The switch turns on the LED.
http://www.msscweb.org
http://www.play-hookey.com/ac_theory/ps_rectifiers.html
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Components
http://www.msscweb.org
Full-wave Diodes Capacitor (Battery)