Question

Why is a generator more difficult to rotate when it is connected to a circuit and supplying current than it is when it is standing alone?

   Why is a generator more difficult to rotate when it is connected to a circuit and supplying current than it is when it is standing alone?

Physics Principle and Problems

Physics Principle and Problems

Paul W. Zitzewitz,… 1st Edition

Chapter 25, Problem 54

Instant Answer

Solved by Expert Mayukh Banik

05/30/2020

Step 1

This means that there is no opposing force acting on the generator. Therefore, it is easier to rotate the generator. This can be represented as: \[Load = 0\] Show more…

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Why is a generator more difficult to rotate when it is connected to a circuit and supplying current than it is when it is standing alone?

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Key Concepts

Lenz's Law

Lenz's Law states that the direction of the induced current is such that it opposes the change in the magnetic flux that produced it. In a generator, when current is drawn from the device, the resulting magnetic field created by the induced current opposes the motion of the generator's rotor, making it more difficult to turn.

Back Electromotive Force (Back EMF) or Counter Torque

When a generator supplies current to a circuit, the induced current produces a magnetic field that interacts with the generator's magnetic field, creating an opposing force. This opposition, known as back EMF or counter torque, requires additional mechanical energy to overcome, which makes the generator harder to rotate while delivering current.

Electromagnetic Induction

This is the process by which a changing magnetic field within a generator induces an electromotive force (EMF) in a conductor. It is the fundamental principle behind generators, where mechanical energy is converted into electrical energy through the motion of coils in a magnetic field.

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