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the Homo polar Motor

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Peter Barnes

on 25 March 2015

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Transcript of the Homo polar Motor

The Homo Polar Motor
By: Amrita, Joanna, & Justina

What is the History of the Homo Polar Motor?
It was the first motor ever made. It was created by Michael Faraday. Michael Faraday demonstrated this motor concept in 1821 at the Royal Institution in London. His construction was a large and crude concept.In 1821, soon after the Danish physicist and chemist Hans Christian Ørsted discovered the phenomenon of electromagnetism, Davy and British scientist William Hyde Wollaston tried, but failed, to design an electric motor. Faraday, having discussed the problem with the two men, went on to build two devices to produce what he called "electromagnetic rotation". One of these, now known as the homopolar motor, caused a continuous circular motion that was engendered by the circular magnetic force around a wire that extended into a pool of mercury wherein was placed a magnet; the wire would then rotate around the magnet if supplied with current from a chemical battery.
How does a Homo Polar Motor work?
A homo polar motor creates rotational movement because of what is known as the Lorentz force. What's happening is that electrical current is flowing from the positive terminal of the battery to the negative and into the battery.
What is a Homo Polar Motor?
A homo polar motor is a direct current electric motor with two magnetic poles, the conductors of which always cut unidirectional lines of magnetic flux rotating a conductor around a fixed axis that is parallel to the magnetic field.
how to make one
what you will need

Copper Wire
A neodymium magnet
A AA battery
how to make a homo polar motor
1. Attach the magnet to the negative side of the battery.

2. If the copper wire is coated, ask for supervision as you or a guardian strip the wire.

3. Bend the wire so that one end touches the positive battery terminal and the other touches the magnet under the negative battery terminal. You'll need copper wire to bend around two sides of the battery; for example, the heart shape seen in the video above works well.

4. As the copper wire grazes the magnet the wire will begin to spin.
what are they used for
In truth, they aren’t that practical at all. Unfortunately, you will never generate enough power from a homopolar motor to power any domestic appliances but they are great fun to make and really useful for demonstrating the effects of electromagnetism and how electric motors work because high currents flow through the wire the battery runs out very quickly.
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