Understanding Physical Science

Mini-Quiz: Alternating Current (AC) Transformers

SCSchool for Champions LLCReviewed 2023-05-30

(updated 30 May 2023)

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

QUIZ

Self-check your understanding

For what is an AC transformer used?
To change AC voltageThat is correct. You understand about AC transformers. To change AC to DCGood try, but not right. Select another answer. To change AC frequencySorry, not correct. Try another button.
What is the formula for the output voltage of a transformer?
VoNo = ViNiSorry, not correct. Try another button. Vo = Ni(No/Vi)Oops! Wrong answer. Re-read the question and try again. Vo = Vi(No/Ni)Correct. You are smarter than you think.
Why does an adapter get warm?
Unused AC energy from going to DC is expended as heatThat is correct. You understand about AC transformers. Heat is needed for it to work properlyGood try, but not right. Select another answer. DC is warmer than ACOops! Wrong answer. Re-read the question and try again.

Pick an answer to see instant feedback. Re-read the lesson if you miss one.

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

Websites

DC and AC Electricity Resources

Physics Resources

Self-check your understanding

Resources and references

Websites

More in Understanding Physical Science