Transformer efficiency.

In summary, transformer efficiency is the measure of how well a transformer converts electrical energy from one circuit to another, expressed as a percentage. It is important because it affects performance and cost, with higher efficiency being more cost-effective and environmentally friendly. Factors that affect efficiency include design, materials, load, and temperature. Efficiency is measured through no-load and full-load tests, with a typical efficiency ranging from 85% to 99%. Larger transformers tend to have higher efficiencies.
  • #1
Nightwatchman
1
0

Homework Statement


What is the the efficiency of a transformer with 13w of primary power.
120Vp, Np unknow
12Vs, 90Np

Homework Equations





The Attempt at a Solution

eff= Psec/ Pri * 100
 
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  • #2
120Vp, Np unknow
12Vs, 90Np

In first line you say Np is unknown and second line you say Np = 90. which is correct?
 
  • #3
%

The efficiency of a transformer can be calculated by dividing the secondary power by the primary power and multiplying by 100%. In this case, the primary power is given as 13W. However, in order to calculate the efficiency, we also need to know the secondary power and the number of turns in the primary and secondary coils. The secondary power can be calculated using the formula Psec = (Vsec^2*Np)/R, where Vsec is the secondary voltage and R is the resistance of the secondary coil. The number of turns in the primary and secondary coils are also needed in order to calculate the efficiency. Without this information, it is not possible to accurately determine the efficiency of the transformer.
 

What is transformer efficiency?

Transformer efficiency is a measure of how well a transformer converts electrical energy from one circuit to another. It is expressed as a percentage and is calculated by dividing the output power by the input power.

Why is transformer efficiency important?

Transformer efficiency is important because it affects the performance and cost of a transformer. A higher efficiency means less energy is wasted and therefore the transformer is more cost-effective and environmentally friendly.

What factors affect transformer efficiency?

The primary factors that affect transformer efficiency are the design and materials used in the transformer, such as the core material, winding resistance, and insulation. The load on the transformer and the temperature also have an impact on its efficiency.

How is transformer efficiency measured?

Transformer efficiency is measured by conducting a no-load test and a full-load test. The no-load test measures the losses when the transformer is not supplying any load, and the full-load test measures the losses when the transformer is supplying its rated load. The efficiency is then calculated using the results of these tests.

What is a typical efficiency for a transformer?

A typical efficiency for a transformer can range from 85% to 99%. The exact efficiency will depend on the design, materials, and load of the transformer. Generally, larger transformers tend to have higher efficiencies than smaller ones.

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