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Step-up, Step-down, and Isolation Transformers
34 questions By Tony R. Kuphaldt
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Question 1 of 34
Calculate the voltage output by the secondary winding of a transformer if the primary voltage is 35 volts, the secondary winding has 4500 turns, and the primary winding has 355 turns.
Vsecondary =
Reveal answerVsecondary = 443.7 volts
Notes:Transformer winding calculations are simply an exercise in mathematical ratios. If your students are not strong in their ratio skills, this question provides an application to sharpen them!
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Question 2 of 34
Calculate the load current and load voltage in this transformer circuit:
Iload = Vload =
Reveal answerIload = 23.77 mA Vload = 8.318 V
Notes:Most transformer problems are nothing more than ratios, but some students find ratios difficult to handle. Questions such as this are great for having students come up to the board in the front of the classroom and demonstrating how they obtained the results.
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Question 3 of 34
Calculate the number of turns needed in the secondary winding of a transformer to transform a primary voltage of 300 volts down to a secondary voltage of 180 volts, if the primary winding has 1150 turns of wire.
Nsecondary =
Reveal answerNsecondary = 690 turns
Notes:Most transformer problems are nothing more than ratios, but some students find ratios difficult to handle. Questions such as this are great for having students come up to the board in the front of the classroom and demonstrating how they obtained the results.
Creative and interesting excercises.