What is the formula for calculating transformer voltage?

Answer 1

There are two kinds of Transformers, autotransformers and isolation transformers. An autotransformer has one coil, an isolation transformer has at least two. To find the output voltage of a transformer, you need to know three things. First is the input voltage. Next are the number of turns on the primary coil, and last is the number of turns on the secondary coil. So! Our input voltage is going to be 120 in all three of the cases I'll give, and the number of turns on the primary coil will be 120--this makes the math easy, although you aren't restricted to putting 120 turns of wire in a 120v primary. You can put a million turns on if you want, and I've seen it. If our secondary has 12 turns, the output voltage will be 12--there is a 10:1 primary:secondary ratio. Normally this is called a "stepdown" transformer. It's used when the device requires less than line voltage to operate. A secondary with 120 turns will give a 120v output voltage. This is an "isolation" transformer. You use this as a safety device. Secondaries with 2500 turns give a 2500v output voltage--perfect for radio frequency amplifying tubes like the 4CX250A. For extra entertainment let's talk about the autotransformer for a minute. As I said above, this has one coil. It's tapped. If you've got 220v coming into a 220-turn coil and there's a tap at 110 turns, you're getting 110v out of it. Every soldier stationed in a country that uses 220v power buys one of these from the local post exchange so he can use the TV set he brought from home.

Answer 2

A: The transformer voltage is nothing more then a ratio of turns from primary to secondary. The power needed is more complex since a certain power must be impressed on the primary to insure the proper power transfer. A transformer actually is nothing more them a power transferring device minus efficiency it transfer the same media to another level that is all that it does. I don't think that there is a clear cut formula that you seek.

Answer 3

Divide the voltage across a winding, by the number of turns. But that is much easier said that done, however, as it is very difficult to determine the number of turns of a transformer's windings.

Answer 4

You cannot. You can only find the turns ratio -which, for an ideal transformer, is the same as the voltage ratio.