Solve Transformer Question: V1/V2=N1/N2

Thread starter CH1991
Start date Dec 14, 2011
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Transformer

In summary, a transformer is an electrical device that changes the voltage level of an AC electrical supply. This is represented by the equation V1/V2=N1/N2, where V1 and V2 are the input and output voltages, and N1 and N2 are the number of turns on the primary and secondary coils. To solve transformer questions, you need to know three out of the four variables and rearrange the equation. The purpose of a transformer is to efficiently transmit electricity over long distances and supply the correct voltage to different equipment. There are various types of transformers, including step-up, step-down, isolation, autotransformers, and three-phase transformers.

Dec 14, 2011

CH1991

Homework Statement

http://i.imgur.com/DBoKH.png

Homework Equations

The Attempt at a Solution

V1/V2=N1/N2, that means there shouldn't be a current. Why it is 0?
Thanks!

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Dec 14, 2011

technician

Look carefully at what is connected to the primary coil.

Dec 14, 2011

CH1991

Sorry, but I didn't notice any difference...

Dec 14, 2011

technician

It is a battery !

Dec 14, 2011

CH1991

Thank you!

What is a transformer?

A transformer is an electrical device that transfers electrical energy from one circuit to another through electromagnetic induction. It is used to change the voltage level of an alternating current (AC) electrical supply.

What does V1/V2=N1/N2 mean in a transformer?

V1/V2=N1/N2 is the equation used to represent the voltage ratio of a transformer. V1 and V2 represent the input and output voltages, respectively, while N1 and N2 represent the number of turns on the primary and secondary coils of the transformer.

How do you solve a transformer question with the V1/V2=N1/N2 equation?

To solve a transformer question using the V1/V2=N1/N2 equation, you need to know the values of three out of the four variables. Once you have the values, you can rearrange the equation to solve for the unknown variable. For example, if you know the input voltage, output voltage, and number of turns on the primary coil, you can solve for the number of turns on the secondary coil.

What is the purpose of a transformer?

The primary purpose of a transformer is to step up or step down the voltage level of an electrical supply. This allows for efficient transmission of electricity over long distances and ensures that the correct voltage is supplied to different types of electrical equipment.

What are the different types of transformers?

There are two main types of transformers: step-up transformers and step-down transformers. A step-up transformer increases the voltage level, while a step-down transformer decreases the voltage level. Other types of transformers include isolation transformers, autotransformers, and three-phase transformers.