How to Identify primary and secondary of a transformer

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how to find primary and secondary winding of transformer?This video is about that topic

A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.It works on Faraday's law of induction.A transformer is made of a soft iron coil with two other coils wound around it, but not connected with one another. The iron coils can either be arranged on top of another or be wound on separate limps of the iron core.

Transformers are used to increase or decrease the alternating voltages in electric power applications.There are two types of transformers, namely: Step down and Step up transformers. Generally, the difference between them is the amount of voltage produced, depending on the number of secondary coils.

The transformers which are used to increase the alternating voltages in electric power applications are called step up transformers.. There are many turns on the secondary winding than in the primary winding in the step-up transformers. Thus, the voltage supplied in the secondary transformer is greater than the one supplied across the primary winding. Because of the principle of conservation of energy, the transformer converts low voltage, high-current to high voltage-low current. In other words, the voltage has been stepped up.

A step-down transformer is the direct opposite of a step-up transformer.In a step-down transformer is one who secondary windings are fewer than the primary windings. In other words, the transformer’s secondary voltage is less than the primary voltage. So, the transformer is designed to convert high-voltage, low-current power into a low-voltage, high current power and it is mainly used in domestic consumption.

Step down transformers are widely used in many electronic circuits.It is important to find out the primary and secondary side
of a transformer.There are different ways to find it out.One way to identify it by the resistance of the winding.In case of a step down transformer,secondary side has less no of turns than that of primary side.Since resistance depends on length of wire,so secondary side has less resistance than the primary side.For step up transformer,it is opposite to step down transformer..

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[nicolasparadis]

Thank you very much. So simple and easy to understand . I don't care for the bad comments about saying in first place that it is a step down transformer, cause the basics of the information is there so well explained. It's like giving the answer in math problem and do it after to make the proof of your answer. Than, you

[jamesallen]

Excellent information. Straight to the point, no bull shite. I have subscribed. By the way, your website does not load.

[dongpedroyi]

What you call primary and secondary depends on which side you want to use as input and output. If you use the high number of turn side (high resistance) as primary (input), it will become a step-down transformer = lower voltage and higher current on the secondary side (output) and vice-versa.

[JamesHamilton]

It can be either one, step up or step down Depends on which set of coils you connect to the power source. One set will step the voltage up and the other set will step it down. If the coils with the most turns and higher resistance is connected to source voltage it will step the voltage down. If the coils with the least resistance, and having fewer turns is connected to source voltage then it will act as a step up transformer. Usually the side with thicker wire indicates a higher current so it will be the lower voltage side. The amount power dissipated on the side used as the primary set of coils (connected to source) will be close to the amount of power dissipated on the secondary set of coils (connected to load). There is minimal losses due to Eddie current and other factors but for all practical purposes in the following equation we will assume that they are equal. We know from Ohms law that E=I×R, and P=I×E where E is the electro motive force or Voltage, I is current, P is Power, and R is resistance. So if Power in equals power out then this means if a voltage is applied to the side with most resistance the current flow will be lower on this side, so the voltage on the other side must decrease causing the transformer to function as a step down transformer. The voltage will be steped down. The amount the voltage is stepped up or down depends on the turns ratio of the transformer.
If the side with fewer windings or less resistance is connected to the source voltage then the current due to less resistance will be higher on the primary side if current goes up and the source voltage stays the same then the power dissipated will increase as well. But the output voltage will be steped up by a factor of the greater number of winding turns that one coil has for each one winding turn in the other coil. In a tranformer with a turns ratio of 10:1 if used as a step up transformer, the voltage on the side with the most resistance will be the side with the most windings. This means that the voltage on the higher resistance side will be 10 times greater than the voltage on the lower resistance side. Lower resistance means higher current flow, as current goes up the voltage must go down. Remeber we already established that for all practical purposes power in is equal to power out. Usually the side with the less turns and least resistance will use heavier guage wire due to higher current flow.

[youpattube]

the title is 'how to identify primary and secondary of a transformer', NOT 'of a step down transformer'. the first thing you say is "this is a step down transformer", without any explanation. why do you immediately invalidate your test ? what if we don't know if our transformer under test is a step up or step down or something else ?

[utkf]

Thank you, just what I needed to know without lots of waffle.

[rajkumarindia]

Can you plz make a video to identify multiple primary and secondary coil windings. You are explanation is simple powerful clear easy to understand. Lot of math calculation will be confusing for beginners Amature hobbist like me.

[darkus]

Thanks for keeping it short and speaking properly.

[JamesHamilton]

I just realized that near the end of your presentation, I do believe you stated your secondary and primary coils wrong for a step-down transformer according to the resistances that you measured.

[ihyaulumuddin]

Thank you, it helps me a lot.
Is it applicable for EE19-A28A Transformer taken from receiver power supply?

[Techno-]

Nothing is Primary and Nothing is Secondary
All things is depending on how we use a transformer ( i.e step up or step down )

[DheerajKumar-dk]

Robojax  I want to know whether Transformer phasing out as most of the people are using AC-DC adapter, LM7805 and LM2596 types converter and why? Must reply!

[ta]

Would if primary winding is open on a bad transformer. How do determine voltage outputs on two secondary windings??. No markings on bad transformer

[alchemy]

So how to you know it is a step-down and not step-up transformer?

[ta]

Trying to find a replacement power transformer

[zerbt]

Depends if it's a step down or step up transformer

[Syncopator]

How to identify the 110 vs 220 connections of a three-wire primary (black, blue, red)?

[mohammadfazeelmuneer]

In transformers no side is primary or secondary. We call them high voltage side or low voltage side.

[divyarthupadhyay]

Bro in my transformer it has pair of black and yellow what I do plz told me

[diyhifi]

I bought a transformer and the label says 110/220 primary (red black red wires), 12 0 12 secondary (blue white blue) . Now my question is how to identify the 220 volts and 110 volts in primary?