# Physics Tutorial 16.17 - Power in an Alternating Circuit. Transformers

There are 3 lessons in this physics tutorial covering Power in an Alternating Circuit. Transformers. The tutorial starts with an introduction to Power in an Alternating Circuit. Transformers and is then followed with a list of the separate lessons, the tutorial is designed to be read in order but you can skip to a specific lesson or return to recover a specific physics lesson as required to build your physics knowledge of Power in an Alternating Circuit. Transformers. you can access all the lessons from this tutorial below.

In this Physics tutorial, you will learn:

• How to calculate the electric power in alternating circuits
• What is the difference between average and total power in AC circuits?
• How is the rms current and voltage related to electric power in AC circuits
• What is power factor? How it is related to reactances and resistance in the circuit?
• What can we do to maximize the power in an AC circuit?
• What are electric transformers? What are they used for?
• How many types of transformers are there?
• What is the difference between ideal and real transformers?
• How the current and emf are related to each other in transformers?

## Introduction

Do you remember what does power represent? How do we calculate the mechanical power?

How the equation of mechanical power is transformed when dealing with electricity?

Do you think a correct value of power is obtained when considering the amplitudes of current and voltage in an AC circuit? What do you suggest in this case?

How can we change the voltage in a circuit? Discuss.

In this tutorial, we will consider again a series RLC circuit to provide answer to the above questions. This is because RLC circuits include all possible power consuming circuit elements. In this way, the explanation is more comprehensive.

Please select a specific "Power in an Alternating Circuit. Transformers" lesson from the table below, review the video tutorial, print the revision notes or use the practice question to improve your knowledge of this physics topic.

Magnetism Learning Material
Tutorial IDPhysics Tutorial TitleTutorialVideo
Tutorial
Revision
Notes
Revision
Questions
16.17Power in an Alternating Circuit. Transformers
Lesson IDPhysics Lesson TitleLessonVideo
Lesson
16.17.1Electric Power as a Rate of Electric Energy Transfer
16.17.2Transformers
16.17.3How does a Transformer Work?

## Whats next?

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5. Continuing learning magnetism - read our next physics tutorial: Maxwell Equations

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