For anyone looking for an online resource that will help you understand electricity and its concepts more I highly recommentd the following website:

Non-destructive Testing Resources... Introduction to Electricity

NDT Resource Center Electricity links

1. Basic Electricity

Science of Electricity- Bill Nye and Chapter 11 TE Learning by Design

• Timeline of Electricity [Tesla PBS]
• OHM law chart

• PHET Activity Simulation

• Ohms Law Calculator
  Volt=K ohms/M Amps
• Ohm lesson  and HOW ARE WATTS, OHMS, AMPS, AND VOLTS RELATED?
• OHM's Sim  
• Electromotive Force

• Virtual Electicity & more  Work sheet
  Phet circuit construction Kit Download and many other virtual kits for technology, science and math. From The University of Colorado at Boulder

• Glossary Gateway to Engineering
  Chapter 14
  Electricity	The flow of electrons through a pathway.
  Electromagnet	A metal core that is rendered magnetic by the passage of an electric current through a surrounding coil.
  Electromotive force	The pressure on electrons to move them through a conductor that is supplied by the power source.
  Electronegativity	The measure of the attraction that an atom has for the electrons orbiting about its nucleus.
  Laws of magnetism	The scientific principle that states that like magnetic poles repel and unlike magnetic poles attract.
  Ohm's law	A mathematical formula that describes the relationship among voltage, current, and resistance: E = I × R.
  Semiconductor	A material that is neither a good conductor nor a good insulator; its electrical conductivity can be precisely altered by a manufacturing process.
  Valence electron	An electron on an atom's outermost orbit.