AC generator -- Understanding coil voltages as function of position

In summary, the voltage in an AC generator is maximum when the coil is parallel to the direction of the magnetic field and minimum (0) when it is perpendicular. This is because the voltage is induced when there is a change in flux, and the flux going through the coil is 0 when it is parallel to the field and maximum when it is perpendicular. The greatest speed at which the flux lines are being cut occurs when the coil is moving parallel to the lines.
  • #1
EF17xx
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Homework Statement


In an ac generator
Voltage is maximum when the coil is parallel to the direction of magnetic field (B)
Voltage is minimum (0) when the coil is perpendicular to the direction of magnetic field (B)

I'm trying to understand why.

Homework Equations

The Attempt at a Solution


A voltage is induced when there is a change in flux.
When the coil is parallel to the magnetic field the flux going through it is 0.
When the coil is perpendicular to the magnetic field the flux going through it is maximum.

I understand that it is the CHANGE in flux that causes a current to be induced. But I am still a bit confused about WHY the viltage is maximum when the coil is parallel to the field
 
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  • #2
When are the flux lines being cut with the greatest speed? When the loop is moving parallel or perpendicular to the flux lines?
 

FAQ: AC generator -- Understanding coil voltages as function of position

What is an AC generator?

An AC generator (alternating current generator) is a device that converts mechanical energy into electrical energy by using the principle of electromagnetic induction. It has a rotating coil or magnet inside a stationary wire coil, producing a changing magnetic field that induces an alternating current in the wire.

How does an AC generator work?

An AC generator works by rotating a coil of wire inside a magnetic field. As the coil rotates, it cuts through the magnetic field lines, creating a changing magnetic flux. This changing magnetic flux induces an alternating current in the wire coil, which can then be used to power electrical devices.

What determines the voltage output of an AC generator?

The voltage output of an AC generator is determined by the speed at which the coil rotates, the strength of the magnetic field, and the number of turns in the coil. The faster the rotation, the stronger the magnetic field, and the more turns in the coil, the higher the voltage output will be.

How does the coil position affect the voltage output?

The position of the coil in an AC generator affects the voltage output because the changing magnetic field is directly related to the position of the coil. When the coil is perpendicular to the magnetic field, the voltage output is at its maximum. As the coil rotates and becomes parallel to the magnetic field, the voltage output decreases and becomes zero when the coil is parallel to the field.

What is the purpose of understanding coil voltages as a function of position in an AC generator?

Understanding coil voltages as a function of position in an AC generator is important for designing and optimizing the generator for maximum efficiency. It also allows us to predict the voltage output at different positions of the coil, which is crucial for determining the overall performance of the generator.

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