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Electric Conductor

In a conductor, electric current can flow freely, in an insulator it can not.

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/conins.html#c1

Computational Learning and Motor Control Lab.

A description of the work done in the course at the University of Southern California

http://www-slab.usc.edu/

DC Electric Power

The electric power in watts represents the rate at which energy is converted from the electrical energy of the moving charges to some other form

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elepow.html#c1

Electric charge

A basic but clear explanation of electric charge.

http://www.ndt-ed.org/EducationResources/HighSchool/Electricity/electriccharge.htm

Electric Fields

A series of definitions relating to electric fields.

http://scienceworld.wolfram.com/physics/topics/ElectricFields.html

Both the electric field and magnetic field can be defined from the Lorentz force law. The electric force is straightforward, being in the direction of the electric field if the charge q is positive, ...

http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfor.html#c2

Current Law

The electric current in amperes which flows into any junction in an electric circuit is equal to the current which flows out. This can be seen to be just a statement of conservation of charge.

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/ohmlaw.html#c3

Optical tweezers simulation

Did you ever imagine that you can use light to move a microscopic plastic bead? Use the optical tweezers to manipulate a single strand of DNA and explore the physics of tiny molecular motors.