link to ClassBrain Home  link to ClassBrain Home
 link to site map
Defining Documents Home 
 US Constitution & The Bill Of Rights
 Amendments To The US Constitution
 Budgets of the US Government
 Important Writings, Papers, & Designs
 Presidential Executive Orders
 Supreme Court Decisions
 plug-in page link
 link to ask classbrain


Patent for the Electric Dynamo
By Energy Information Administration
Mar 17, 2006, 11:54am

Tesla patented a device to induce electrical current in a piece of iron (a rotor) spinning between two electrified coils of wire. This rotating magnetic field device generates AC current when it is made to rotate by using some form mechanical energy, like steam or hydropower. When the generated current reaches its user and is fed into another rotating magnetic field device, this second device becomes an AC induction motor that produces mechanical energy. Induction motors run household appliances like clothes washers and dryers. Development of these devices led to widespread industrial and manufacturing uses for electricity.

The induction motor was only part of Tesla's overall conception. In a series of history-making patents, he demonstrated a polyphase alternating-current system, consisting of a generator, transformers, transmission layout, and motor and lights. From the power source to the power user, it provided the basic elements for electrical production and utilization. Our AC power system remains essentially unchanged today.

In 1888, George Westinghouse, head of the Westinghouse Electric Company, bought the patent rights to Tesla's system of dynamos, transformers and motors. Westinghouse used Tesla's alternating current system to light the World's Columbian Exposition of 1893 in Chicago. Then in 1896, Tesla's system was used at Niagara Falls in the world's first large hydroelectric plant.

Patent Number 390,414

Learning Links

Explore Tesla's original patent documents. Patent # 390,414

Learn more about Tesla and his inventions with the help of Google

© Copyright 2006 by

Top of Page



Latest Headlines
Patent For The Electric Guitar
Patent for the Cotton Gin
Patent for the Electric Lamp
Patent for the Telephone
Patent for the Electric Dynamo

Corporate info | ClassBrain Home | Privacy and Copyright | Contact | Parents & Teachers | NeedHelp?