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About Turns Ratio
One of the beautiful things about AC is how easy it is to change voltages. With a simple ratio between the amount of turns on the primary versus the secondary coil of a transformer, you can easily figure out the voltage in versus the voltage out as well as the current in and out. If you know the ratio and the input, you can find the output. If you know the ratio and the output, you can find the input. If you don’t know the ratio but know 3 out of the 4 variables of voltage input/output and current input/output, then we can figure out the last variable as well.
About Output Voltage
With a transformer, sometimes you know the turns (or the turns ratio) and the input voltage but you want to confirm the expected output. The biggest difficulty with this is making certain that you don’t reverse the ratio - make sure that you don’t swap the input turns versus the output turns! A simple common-sense check to make sure that the voltage is larger or smaller as you anticipate should make it easy to avoid any problems.
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