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In a conductor, electric current can flow freely, in an insulator it can not.
A description of the work done in the course at the University of Southern California
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
A basic but clear explanation of electric charge.
A series of definitions relating to electric fields.
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, ...
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.
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.
A simple non-mathematical description of how a helicopter flies and why a tail motor is required to keep it from spinning.
This site discusses the concepts of electric force fields and lines of force.
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