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Mini-Quiz of how an AC transformer works. Key words: physical science, Alternating Current, DC, direct current, magnetism, voltage, electromagnet, house current, high voltages, School for Champions. Copyright © Restrictions

Mini-Quiz: Alternating Current (AC) Transformers

by Ron Kurtus (revised 29 April 2012)

Take this Mini-quiz to check your understanding of the lesson material.



1. For what is an AC transformer used?

To change AC voltage

To change AC to DC

To change AC frequency

2. What is the formula for the output voltage of a transformer?

VoNo = ViNi

Vo = Ni(No/Vi)

Vo = Vi(No/Ni)

3. Why does an adapter get warm?

Unused AC energy from going to DC is expended as heat

Heat is needed for it to work properly

DC is warmer than AC

If you got all three correct, you are on your way to becoming a Champion in Physics. If you had problems, you had better look over the material again.


Be proud of your knowledge


Resources and references

Ron Kurtus' Credentials

Websites

Elements of AC Electricity - Basic electronics tutorial site

DC and AC Electricity Resources

Physics Resources

Books

Transformers and Motors by George Shultz

Teach Yourself Electricity and Electronics by Stan Gibilisco

Top-rated books on Electrical Power Generation


Questions and comments

Do you have any questions, comments, or opinions on this subject? If so, send an email with your feedback. I will try to get back to you as soon as possible.


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Mini-Quiz: Alternating Current (AC) Transformers



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