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ZingPath: Electromagnetic Force and Induction

Transformers

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Electromagnetic Force and Induction

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Lesson Focus

Transformers

Physics

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You will discover and learn about electromagnetic induction and its applications. Experiment with induced fields and use your new knowledge to design a winning electric race car.

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Now You Know

After completing this tutorial, you will be able to complete the following:

  • Explain how changes in a magnetic field create a current in a winding.
  • Calculate transformer voltages and currents, given the turn’s ratio.
  • List uses of transformers.

Everything You'll Have Covered

What is a transformer?

~ A transformer is a device that changes the high AC voltage from a wall outlet into a lower voltage for use by various types of appliances. Some transformers can also increase the voltage from the wall outlet, in cases where a higher voltage is necessary.

What are transformer windings?

~ These are the thin copper wires that are coiled around the core of a transformer.

How does a transformer work?

~ When the transformer is plugged into an outlet, the electrical current flows through the primary winding and a magnetic field is produced. The magnetic field reaches the secondary winding and creates an oscillating flux through the solenoid. This change in flux results in the creation of an induced current in the secondary winding.

What is the difference between a step-up and a step-down transformer?

~ In a step-up transformer, the number of loops in the secondary winding is greater than the number of loops in the primary and, as a result, the voltage output of the transformer is higher. In a step-down transformer, the number of loops in the primary winding is greater than the number of loops in the secondary and, as a result, the voltage output of the transformer is lower.

Tutorial Details

Approximate Time 2 Minutes
Pre-requisite Concepts Students should be able to define the following terms: alternating currents, currents, and induced currents.
Course Physics
Type of Tutorial Animation
Key Vocabulary alternating currents, currents, induced currents