Generation of Electricity (03:36)
A steady electric current generates a magnetic field around a wire. A wire wound into a coil strengthens the magnet force. Faraday's experiment with the electromagnet is illustrated and explained.
Electricity: Induction and Generator Effect (02:38)
A constant magnet field does not generate an electric current. It is a changing magnetic field that induces an electric current. As long as the magnet field moves in relation to the conductor, electricity is generated--the generator effect.
Electricity Can Do Work (00:46)
The discovery of the battery allowed chemical energy to be converted to a supply of electric current. Electricity could be made to do useful work. This means mechanical devices could convert dynamic energy into electrical energy.
Generator Left Hand Rule (03:18)
The left hand rule is a method to determine the relationship of the motion of the conductor in a magnetic field to the direction of the induced current.
Generator Electromotive Force (02:44)
Electrical pressure, abbreviated emf, is the force that pushes electrons through a conductor; it is measured in volts. It describes the theoretical capability of the generator to do work.
Alternative Current (AC) Generators (03:31)
AC generators produce electric current, usually by rotating a conductor in a magnetic field, thereby generating current through electromagnetic induction. They are used to transform mechanical energy into AC electrical power.
Direct Current (DC) Electric Generation (02:26)
Direct current (DC) generators are rotating electric machines that deliver an unidirectional voltage and current in smaller mechanisms such as car and boat engines.
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