Shake Flashlight North Dakota State College of Science Applied Science and Technologies

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

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

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.

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.

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 C 1. The switch turns on the LED.

Components Full-wave DiodesCapacitor (Battery)