Download Electrical Basics

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
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
http://www.msscweb.org
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
http://www.msscweb.org
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 fullwave 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
http://www.msscweb.org
Full-wave Diodes
Capacitor (Battery)
www.ndscs.edu