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How can change in the voltage of a transformers primary cool create a change in a secondary coils voltage?
Wiki User
∙ 8y ago
The turns ratio determines how the transformer transforms the voltage and current applied to the primary winding (I'm labelling as '1'). Here are some equations:
N1 / N2 = turns ratio
V2 = V1 * (N2 / N1)
I2 = I1 * (N1/ N2)
Wiki User
∙ 14y ago
Wiki User
∙ 12y agoThe ratio (secondary voltage)/(primary voltage) is exactly the ratio (secondary turns)/(primary turns).
You specified a "step-up transformer", i.e. one where secondary voltage > primary voltage.
Since the ratio of voltage is greater than 1, the ratio of turns is also greater than 1.
Wiki User
∙ 11y agoLet N1 be the number of turns at the primary winding and N2 the number of turns at the secondary winding.
Define the ratio as N = N1 / N2.
N1 I1 = N2 I2,
V1 / N1 = V2 / N2,
that is
N I1 = I2,
V1 = N V2.
IE: say you have a transformer with 110V at the primary winding, N1=10 turns at the primary and N2=5 turns at the secondary. secondary winding will show 110V*5/10=55V.
Physical reason is that you share and balance a unique induction flux between primary and secondary windings, that is
Flux = N1I1A
transferred to the secondary:
... = N2I2A,
where A is the single turn surface.
Finally, you can derive voltage ratios from Faraday's induction law:
Vk = Nk d(Flux) / dt.
Wiki User
∙ 12y agoThe number of loops in the primary and the secondary coils determine how the voltage is transformed because these loops are used to determine the transformer ratio which in turn determines whether or not the voltage will be stepped up or down.
Wiki User
∙ 10y agoThe number of loops in the primary and secondary coils determine whether it decreases or increases the voltage.
Wiki User
∙ 13y agoAs we know the side having high no. of turns has high voltage.
so, step up type Transformers have more no, of turns in secondary coil.
Wiki User
∙ 6y agoFewer turns in the secondary.
Wiki User
∙ 14y agoyes
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A transformer is a device used to?
Transformers change voltage and current from the primary side to the secondary side, while keeping the power in equal to the power out (minus losses). Any transformer will increase the voltage applied to the secondary (or low voltage side) to the primary (or higher voltage side).
In transformer how can you increase or decrease the voltage?
In a transformer, you increase or decrease the voltage by changing the turns ratio between the primary or secondary windings. Increase the turns on primary, and secondary voltage goes down. Increase the turns on secondary, and secondary voltage goes up. Note that this usually involves choosing a different transformer, as changing the turns ratio is not something that can be easily done in the field. Some transformers have multiple taps on one of the windings which can be used to change turns ratio.
Why transformer ratio is secondary winding voltage by primary winding voltage but not primary winding voltage by secondary winding voltage?
The transformer primary winding is connected to the alternating current supply. This causes a varying current in the primary winding, which creates a varying magnetic field in the transformer core. Because the primary voltage is alternating, the flux is also alternating - expanding and contracting, and changing polarity in time with the supply. This alternating core flux 'cuts' the secondary winding/s of the transformer, and induces a voltage in the secondary coil/s. As long as there is a magnetic field that is moving, and a conductor for it to move across, it will induce a voltage in the conductor. While the actual induced voltage depends on the amount of flux, the amount of conductor material and the rate of change of the flux, the actual voltage can be calculated from: Vsec = ((Vprim * Nsec) / Nprim) where V = voltage, N = number of turns of wire in the coil, prim = primary and sec = secondary. Transformers don't work on DC - they give a brief pulse out at switch-on and switch-off, because that's the only times the current is changing and the flux is moving. If you have to transform DC, you use a switching circuit that 'chops' the DC into a series of pulses that simulate AC as far as the 'moving flux' requirements of the transformer are concerned.
HOW TO CALCULATE THE IMPEDANCE FOR THE TRANSFORMER?
The term, 'percentage impedance', is a little misleading, as it is defined as 'the value of primary voltage that will cause rated current to flow in the secondary winding, expressed as a percentage of the rated primary voltage'. So, the test is carried out as follows: the secondary winding is short-circuited through an ammeter capable of reading the rated secondary current. A variable voltage is applied to the primary winding. The primary voltage is gradually increased until the ammeter indicates rated secondary current. That primary voltage is then expressed as a percentage of the rated primary voltage -and that value is the transformer's 'percentage impedance'.
Why do you use Two Winding run and start winding in the single phase motor?
Any transformer uses a minimum of two windings to change the voltage value. The primary side of the transformer is usually connected to the existing voltage. The secondary side of the transformer is usually connected to the load, who's voltage could be higher or lower voltage than the primary voltage.If the secondary voltage is increased the transformer is known as a step up transformer and if the secondary voltage is decreased the transformer is known as a step down transformer.The transformer terminal markings for the primary are H1 and H2 on a single coil primary and H1 to H4 on a dual voltage primary winding. Like wise the secondary terminal markings are X1 and X2 on a single coil secondary and X1 to X4 on a dual voltage secondary winding.
How can a change in voltage of a transformers primary coil create a change in the secondary coils voltage without the coils touching?
The more coils you have on one side will increase the magnetic force
What are the disadvantages of step down transformers?
There are no disadvantages to either step-up, or to step-down, transformers. They do exactly what they are intended to do: change voltage levels while maintaining approximately the same power level on both primary and secondary sides.
A transformer is a device used to?
Transformers change voltage and current from the primary side to the secondary side, while keeping the power in equal to the power out (minus losses). Any transformer will increase the voltage applied to the secondary (or low voltage side) to the primary (or higher voltage side).
What is the definition of transformation ratio?
The turns ratio of a transformer is the number of primary turns to secondary turns. This defines how the transformer will change the voltage and current. For N1 primary turns, and N2 secondary turns, N1/N2 will be the turns ratio; the secondary voltage will be:the primary voltage x (N2/N1); The secondary current will be:primary current x (N1/N2)
In transformer how can you increase or decrease the voltage?
In a transformer, you increase or decrease the voltage by changing the turns ratio between the primary or secondary windings. Increase the turns on primary, and secondary voltage goes down. Increase the turns on secondary, and secondary voltage goes up. Note that this usually involves choosing a different transformer, as changing the turns ratio is not something that can be easily done in the field. Some transformers have multiple taps on one of the windings which can be used to change turns ratio.
How can a change in the voltage of a transformer's primary coil create a change in the secondary coils voltage without the coils touching?
The more coils you have on one side will increase the magnetic force
How can a change in the voltage of a transformer's primary coil create a change in the secondary coil's voltage without the coils touching?
The more coils you have on one side will increase the magnetic force
How can a change in voltage of a transformer's primary coil create a change in the secondary coil's voltage without the coils touching?
The more coils you have on one side will increase the magnetic force
If the primary winding of the transformer in the power supply opens what will you observe in the rectified output?
There would be no rectified output. The transformer primary has to be closed to induce a current into the secondary winding. At this point of the secondary the voltage is still AC. This voltage is then applied to the rectification bridge to change it to DC. So you can see how no voltage on the primary, the same as the unit being unplugged, affects the output voltage.
What is no of turns in winding of secondry side of Trasformer when the input is 11KVA and output is 430V?
Turns ratio will define the change in voltage from primary to secondary. What you have supplied is not enough information - you have 1 voltage, and a power value (Killovoltamperes = KVA), which is clearly not enough to answer the equation: N1/N2 = V1/V2, where N1 is the primary side turns, N2 is the secondary, V1 is primary, and V2 is secondary voltage.
Why transformer ratio is secondary winding voltage by primary winding voltage but not primary winding voltage by secondary winding voltage?
The transformer primary winding is connected to the alternating current supply. This causes a varying current in the primary winding, which creates a varying magnetic field in the transformer core. Because the primary voltage is alternating, the flux is also alternating - expanding and contracting, and changing polarity in time with the supply. This alternating core flux 'cuts' the secondary winding/s of the transformer, and induces a voltage in the secondary coil/s. As long as there is a magnetic field that is moving, and a conductor for it to move across, it will induce a voltage in the conductor. While the actual induced voltage depends on the amount of flux, the amount of conductor material and the rate of change of the flux, the actual voltage can be calculated from: Vsec = ((Vprim * Nsec) / Nprim) where V = voltage, N = number of turns of wire in the coil, prim = primary and sec = secondary. Transformers don't work on DC - they give a brief pulse out at switch-on and switch-off, because that's the only times the current is changing and the flux is moving. If you have to transform DC, you use a switching circuit that 'chops' the DC into a series of pulses that simulate AC as far as the 'moving flux' requirements of the transformer are concerned.
How step up transformer step up the input voltage?
It depends on the ratio of turns from primary to secondary.
