Lesson: Electromagnetic Induction in Transformers Physics • 9th Grade

In this lesson, we will learn how to calculate the change in the potential difference and current produced by a transformer.

Lesson Plan

Students will be able to

recognize that transformers are used with alternating current,
recognize that transformers change both the potential difference and the current of an electrical signal,
recall that magnetic materials can be used for the cores of transformers,
use in all permutations,
use in all permutations.

Lesson Presentation

Lesson Video

Lesson Explainer

Lesson Playlist

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01:48
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02:16

Lesson Worksheet

Q1:

A efficient transformer has an input potential difference of 20 V and an input current of 4 A. If its output potential difference is 40 V, what is its output current?

Q2:

A transformer has 300 turns on its primary coil and 150 turns on its secondary coil. If the output potential difference is 100 V, what is the input potential difference?

Q3:

A efficient step-down transformer has 100 turns on its primary coil and 20 turns on its secondary coil. The input potential difference is 250 V and the input power is W. What is the output current?