# Understanding Transformer Power Measurements with Open Circuit Experiment

• Engineering
• nhrock3
In summary, they are saying that aM = L_c. If we measure the voltage thrown those to points, we need to know the current to get z_eq. And I don't know how.

#### nhrock3

http://i44.tinypic.com/142zgg5.jpg

they say that we can measure aM and R_c

they say that in a good transformer the power waisted on R_1
is much smaller then on R_c
then we can neglect the power on R_c
so the power measured on the power meter will be the power on R_c

http://i39.tinypic.com/20zpcvm.jpg

why
aM=L_c
?
if we measure the voltage threw those to points
we need to know the current to get z_eq
and i don't have short circuit citiation here

nhrock3 said:
http://i44.tinypic.com/142zgg5.jpg

they say that we can measure aM and R_c

they say that in a good transformer the power waisted on R_1
is much smaller then on R_c
then we can neglect the power on R_c
so the power measured on the power meter will be the power on R_c

http://i39.tinypic.com/20zpcvm.jpg

why
aM=L_c
?
if we measure the voltage threw those to points
we need to know the current to get z_eq
and i don't have short circuit citiation here

I think they are just asserting that aM = L_c. I don't know why they labelled it aM in the first place. It's the magnetizing inductance of the transformer, I would think, in parallel with the transformed load resistance.

i posted it in the wrong sub forum
damn i am tired

No worries, thread moved. Are they just making a definition for us to use?

no they just say that from the total impedance we could know aM

but i don't know how?

nhrock3 said:
no they just say that from the total impedance we could know aM

but i don't know how?

What does aM stand for anyway?

## 1. What is an open circuit experiment?

An open circuit experiment is a scientific experiment that involves creating a circuit with an intentional gap or break in the circuit. This gap prevents the flow of electric current and allows for the study of how different materials or components affect the circuit.

## 2. What is the purpose of an open circuit experiment?

The purpose of an open circuit experiment is to study the properties and behavior of materials or components in a circuit. By creating an intentional gap in the circuit, scientists can observe how the circuit is affected and measure various parameters, such as voltage and resistance.

## 3. How is an open circuit experiment different from a closed circuit experiment?

In an open circuit experiment, a gap or break is intentionally created in the circuit, preventing the flow of electric current. This allows for the study of the effects of different materials or components on the circuit. In contrast, a closed circuit experiment has no intentional gaps and allows for the flow of electric current through the entire circuit.

## 4. What are some examples of open circuit experiments?

Some examples of open circuit experiments include studying the effects of different resistors, capacitors, or other components on the circuit. Another example is testing the conductivity of different materials by creating an open circuit with the material in the gap.

## 5. What are the potential applications of open circuit experiments?

Open circuit experiments have various applications in different fields of science and engineering. They can be used to study the properties of materials, design and test new components for electronic devices, and improve the efficiency of existing circuits. They are also crucial in understanding the fundamental concepts of electricity and circuitry.