Since a current bearing wire has a magnetic field, placing the same wire in an external magnetic field will mean it will experience a force. This is known as the motor effect.
Start by watching the video
Start by watching the video
Check your understanding.
The following two video will help consolidate your understanding of the Motor Effect
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The motor effect, the foundational concept in all electric motors, is easy to demonstrate with just a few simple items.
In this next video I not only demonstrate it qualitatively, I also show how to collect data to establish the magnetic fields of the magnets that are used in this demonstration A simple yet effective demo teachers can use the classroom to help their students |
A current balance is a tool used in school to examine the motor effect. Its basically a swing which experiences a force upward on one side due to the motor effect, and a weigh on the other which counter balances it.
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The force between two wires
In the previous videos we discussed that a current bearing wire will generate a magnetic field. What if we placed another card bearing wire in that magnetic field?
We now have two current bearing wires that are in each other's magnetic field and due to the motor effect, both should experience forces.
This video examines this key principle and the mathematical models that explain it.
Check your understanding
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A sample problem
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Two applications
Here are two applications that rely on the motor effect to work.
Useful to view, to consolidate your understanding.
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A galvanometer is a device that responds to current. Its designed in such away that in recorded deflection is proportional to the current input.
This is useful, as it allows it to be calibrated so that it can act as an ammeter, or voltmeter |
Classic speakers vibrate a cone, which in turn generates sound.
They use an alternating current and the motor effect to do this |
How well do you know the motor effect?
An important application of the motor effect is the working of a DC motor. This will addressed in the next lesson
