3 you will not be required to understand magnetic

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Unformatted text preview: 2 14. Transformers are devices with turns of wire around a primary (p) core and turns of wire around a secondary (s) core. Transformers step up or step down voltages according to the p ­to ­s turns ratio, and vice versa for current. Transformers only work with AC voltage. The transformer equations are: N VS I S = VP I P VS = S VP NP Textbook exclusions: 23.3: You will not be required to understand magnetic devices such as microphones, pickups, disk drives, credit card readers, or tape recording heads. 23.8: RL circuits will not be covered. Fair game for the exam is anything in the book with the exception of the exclusions above, anything in the lec...
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