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It depends on the type of transformer.
If it is a step up transformer the number of turns in secondary side is higher than primary.
Stepdown means it will have fewer number of windings on the secondary side turns when compared with the primary side.
An isolation transformer has the same number of windings on the primary as the secondary.
The ratio of the windings is proportional to the increase or decrease in the secondary voltage. For example, twice the windings doubles the voltage and 1/2 the windings halves the secondary voltage. The isolation transformer is denoted as 1:1 and has the same voltage on the secondary as the primary.
The ratio of secondary turns to primary turns is the same as the ratio of secondary voltage to primary voltage.
e.g. if the secondary to primary turns ratio is 1/10, then the secondary voltage will be one tenth of the primary voltage.
Wiki User
∙ 12y ago
Wiki User
∙ 12y agoThere is no practical way of determining the number of turns in either the primary or the secondary winding of a transformer. For an ideal transformer, the turns ratio is the same as the voltage ratio.
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A transformer has 150 turns on the primary coil and is connected to a 120 volt power source?
600 volts is five times the 120 volt primary, so the secondary winding must have 750 turns, which is five times as many turns as the 150 turns of the primary winding.
How does a transformer change voltage and current?
A welding transformer uses the alternating current supplied to the welding shop at a high voltage to produce the low voltage welding power
How many amps does a 3 kva transformer draw?
The primary current of a transformer depends upon the secondary current which, in turn, depends upon the load supplied by the transformer. There is not enough information in the question to determine the rated primary and secondary currents of the transformer.
How can a CT generate a lethal high voltage when not connected to burden resistance?
A CT is a current transformer. The key word is transformer. Any transformer has a turns ratio. Take a 480V to 120V transformer for instance. The ratio is 4:1, that is for every turn of wire on the secondary winding, there are four windings on the primary. So, if there are 200 turns on the secondary, there are 800 on the primary. We can reverse that same transformer to make it a step-up transformer. Now we would say it has a turns ratio of 1:4. Lets take that transformer and modify it (in our imagination) to see what will happen. Every time, we will apply 120V to the primary, and measure the output voltage on the 800 turn secondary. We will change the number of turns on the primary each time. First, the original ratio: 200T (turns) : 800T (turns) = 1:4 (ratio) = 120V (input) : 480V (output) OK, that seems pretty obvious. But now lets start removing turns from the primary. Watch the trend of secondary voltage: 100T : 800T = 1:8 = 120 : 960 50T : 800T = 1:16 = 120 : 1920 25T : 800T = 1:32 = 120 : 3840 5T : 800T = 1:160 = 120 : 19200 2T : 800T = 1: 400 = 120 : 48000 Wow, the output voltage for our transformer with a two-turn primary is a whopping 48000 volts! Is it possible to have a transformer with a one-turn primary? That is exactly what a current transformer is! the bus wire that passes through the CT forms a one-turn primary, and the many-turn CT coil forms the secondary. If the secondary is shorted, the secondary reflects the primary current divided by the number of secondary turns. But if the CT is open, the current ratio is now 1:zero (no load), the voltage ratio is the inverse - 1:infinity. So, if the CT is not shorted with a very low resistance, it tries to be a voltage transformer with an extremely high secondary voltage. In practice, the voltage is limited by coronal discharge and/or insulation breakdown of the windings. But it can produce some pretty good fireworks and smoke while it is happening! I once observed a facility electrician at one of my customers industrial plants accidentally cut through CT wiring while it was energized. He thought the conduit was abandoned and he was removing it. That CT wiring easily produced an impressive 2-inch continuous arc. This is why CT's are wired through special terminal blocks that short out the CT when the disconnect is pulled. You should never try to work CT wiring hot, and not under any circumstances if you are not trained and qualified!
How many amps will a 37.5 KVA transformer carry?
It depends on the rated voltage of its secondary.
What is the voltage in the secondary coil if the primary coil is supplied with 120V?
I assume that you are speaking theoretically, as it is unlikely that a practical transformer will have just ten turns ('loops') in its secondary coil. In any event, you have not provided sufficient information to be able to answer your question, as it's necessary to know how many turns there are on the primary winding.
An isolation transformer has 500 turns on the primary winding how many turns are on the secondary?
An isolation transformer is intended to isolate the ground path in the primary from the secondary while maintaining the same voltage on the secondary. This means a turns ratio of 1 to 1. If there are 500 turns on the primary, then there will be 500 turns on the secondary.
How many coils does a autotransformer have?
only single coil is use as a primary and secondary coil in a auto transformer.
What type of voltage is passed trough a transformer?
Voltage doesn't 'pass through' anything! Voltage is another word for 'potential difference', and is measured between two points in a circuit. For a transformer to work, it's necessary to apply an a.c. voltage across the transformer's primary terminals.
How can find the primary turns of the transformer knowing the primary voltage of the transformer?
The ratio of the primary voltage to the secondary voltage is proportional to the ratio of windings. So if the primary voltage is 120 volts and the secondary is 240 volts there are twice as many turns in the secondary.AnswerAs the previous answer says, you can work out the turns ratio of a transformer, but knowing the primary and secondary voltages will not help you determine how many turns are on each winding.
A transformer has 150 turns on the primary coil and is connected to a 120 volt power source How many turns will be needed on the secondary coil to provide a secondary voltage of 40 volts?
600 volts I'd like to point out that your question is asking for the secondary voltage, which is usually lower than the primary, where there are more windings on the secondary than primary - Thus your secondary is higher voltage than your primary. I would say the question should be worded differently so the primary has 500 windings, and the secondary has 100 windings.
Difference between input and output transformer?
The 'input' side of a transformer is called its 'primary' side, whereas the 'output' side is termed its 'secondary' side. The ratio of its secondary to primary voltage is equal to the ratio of the number of turns in the secondary windings to the number of turns in the primary winding. So if, for example, a transformer's secondary winding has twice as many turns as its primary winding, then the secondary winding will produce twice the voltage applied to the primary winding.
What value for a transformer determines the amount of voltage that is stepped up or down?
For an ideal transformer, the voltage ratio is exactly the same as its turns ratio. So if, for example, there are twice as many turns on the secondary winding as there are on the primary winding, then the secondary voltage will be twice that of the primary and the transformer will be a 'step up' type.
A transformer has 150 turns on the primary coil and is connected to a 120 volt power source?
600 volts is five times the 120 volt primary, so the secondary winding must have 750 turns, which is five times as many turns as the 150 turns of the primary winding.
What is the maximum voltage on the secondary side of the transformer?
Transformers come in very many varieties and voltages. Transformers have ratings regarding the electrical power that they are connected to. The most important ratings are voltage, power and current. In general the insulation level and number of windings in the secondary and primary determine the maximum rated voltage, and the size of the magnetic wire that makes up the windings, and mass of the iron core, determines the rated power and rated current. It is the insulation level therefore, that determines the maximum, safe voltage that can occur on both the secondary side and the primary side. The turns ratio between the primary and secondary coils of the transformer determines the secondary voltage with respect to the primary voltage. If the primary coil has 1000 turns, and the secondary coil has 100 turns, the transformer turns ratio (usually designated by the letter "a") is 100 / 1000 = 0.1. If a = 0.1, then if 1000 volts are applied across the primary coil, ideally, 100 volts will be measured across the secondary. Transformers have been manufactured with secondary voltage ratings in the range of millivolts, to 1,000,000 volts.
How does ignition coil transform low voltage to high voltage?
A: The coil is really a transformer. The 12 enter the coils and charges with current as the point opens up this charge is released as energy about 100 mw. This release is transformed to hi voltage at the secondary by a primary to secondary turn ratio like 1:3333 more or less. Since the primary is open the same ratio will feed the primary that is why we see ringing and the point have capacitor to protect from false firing. <<>> The coil is a transformer, but we know that DC will not work with a transformer. A supply of 12 volts DC is applied to the coil's primary winding. In series with this coil is a set of breaker points. These points are used to interrupt the 12 volt supply from the coil. When the 12 volt supply is interrupted, the magnetic field around the primary winding collapses. This collapsing field induces a voltage into the secondary coil of the transformer. The secondary coil has many more turns that the primary coil and the voltage induced will be in the 10,000 to 15,000 volt range. This high voltage is needed to make the voltage jump across the air gap in the spark plug.
What is the out put of a step down transformer who's primary is 100 volt ac?
It depends on the turns ratio of the transformer windings. If, for example, there are half as many turns on the secondary (output) winding as there are on the primary (input) winding, then the secondary voltage will be half the primary voltage -in this case, 50 V.The formula is: Vs = Vp x (Ns/Np) -where N = number of turns, p = primary, s - secondary.
