Lesson: Electromagnetic Induction in Generators

In this lesson, we will learn how to describe electromagnetic induction in devices such as generators and dynamos.

Video

14:19

Sample Question Videos

04:32
05:32
03:54

Worksheet: 8 Questions • 3 Videos

Q1:

The graph shows the potential difference against time for three current sources.

Which two current sources have a potential difference with a magnitude that is always nonnegative?

Which current source has a potential difference that is constant over time?

What is the peak voltage of source (c)?

What is the peak voltage of source (b)?

Which of the current sources shown in the graph is most likely to be produced by a dynamo containing a commutator?

Q2:

Parts (a), (b), (c), and (d) of diagram (A) show a setup for a simple alternating current generator. A single loop of copper wire rotates in a uniform magnetic field provided by two permanent magnets. The four parts of the diagram show the loop in four different positions as it rotates.

Diagram (B) is a graph of the current outputted by this generator over time.

Which position of the loop in diagram (A) does the point in diagram (B) correspond to?

Q3:

The diagram shows the setup for a simple alternating current generator. A loop of copper wire spins about an axis in a uniform magnetic field between two permanent magnets.

What components are marked by A in the diagram?

What components are marked by B in the diagram?

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