Shake Flashlight

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# Shake Flashlight - PowerPoint PPT Presentation

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

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Presentation Transcript

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
• Ohm’s Law: V = I x R (voltage = current x resistance)

Closed Circuit

Closed Circuit

Basic Electrical Principle

A magnetic field is generated around a wire as current flows through it.

http://www.educypedia.be/electronics/javaelectricity.htm

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

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

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

Components

Full-wave Diodes Capacitor (Battery)

http://www.msscweb.org