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In 2 words, you cannot! It is like asking how can I make a 60W light bulb into a 30W light bulb. If you are wanting to know this because a specification dictates that you need a 3VA transformer then anything larger is OK. However, you must pay attention to the voltages on the transformer. Firstly, assuming that this transformer is to operate on the mains supply, it should have the correct primary voltage for the mains supply in your area. In most, though not all of Europe, it is standardised at 230V 50Hz. The secondary (usually the output) should have the desired voltage output. This, for example, might be 6V A.C. If it is the only output then, if it is a 6VA transformer, it will be able to supply 1A maximum current. If it is a 3VA transformer, supplying 6V, it will be able to supply a current of 0.5A maximum. The term VA is for Volt-Amps. It refers to the power that would be developed in a resistive load. Hence the secondary voltage (V) multiplied by the maximum current rating (A) gives VA. Thus, if you have a transformer rated at 12VA and the secondary voltage is 5V then the maximum current the transformer can supply is VA/V=12/5=2.40A
Another AnswerThe volt ampere rating of a transformer simply indicates the maximum load it can supply without overheating. The same transformer can supply ANY load below that value. So there's absolutely no problem operating a 6 V.A transformer at 3 V.A.
Wiki User
∙ 10y ago
Wiki User
∙ 14y agoIt is the load that governs the output current of a transformer. That is why it is very important to match the transformer to the load. If the load current is higher than the rating of the transformer then overheating of the transformer will occur and eventually the Transformers primary or secondary fusing will open and disconnect the load.
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How do you reduce a 230v ac transformer to produce 140v ac?
By using step-down transformer
Why transposition required of low voltage power transformer winding?
It is to reduce circulating current losses on winding.
A device that decreases voltage?
Step down transformer, potentiometer or rheostats can all be used to reduce voltage.
Why are stripes of iron plates joined instead of using a single block of iron core in a transformer?
To reduce heat generated and eddy current losses in transformer's core during operation.
Why excitation transformer vector group is only DY5?
This is basically to reduce the harmonics injected back in the grid which are generated because of the controller rectifier circuit (Thyristor Bridge - B6C) after the transformer secondary.
How do you measure the volt ampere rating of a transformer?
Your transformer should have a namplate on it that states how many amps or fractions of amps it can produce. You would then multiply that number by your secondary voltage to get your VA rating. sec. voltage 12v X .05 amp = 12 X .05= .6va
How do you reduce a 230v ac transformer to produce 140v ac?
By using step-down transformer
How do you reduce DC?
by using a resistor or capacitor or transformer
How you can reduce voltage without use of transformer?
a resistor
What happens if a 208VAC primary voltage is connected to a 240VAC stepdown transformer to 208VAC?
The transformer will act as a step down transformer in the ratio of 240 to 208. This will reduce the 208 input to 180.
How do you reduce core losses?
There are various measures that can be taken to reduce core losses. Lamination of the transformer core is believed to reduce core losses significantly.
Why does my 120v 24v reduce to 28v. when you connect it to your boiler it blows out the transformer. is a problem with the transformer or the panel?
Please go to discuss question page.
Why is transformer made of a number of iron sheets?
That is to reduce eddy currents, and therefore, transformer losses - since the eddy currents are wasted energy.
Explain why cruciform shape is used in transformer core?
to reduce core reluctance..
How do you reduce 12 volts to 3.7 volts?
If the voltage is AC a transformer can be used.
Why earthing is use in transformer?
Earthing of a transformer is done to 1:reduce the sensitivity of protective relays. 2:reduce the damage due to fault current. 3:get rid of great loss of equipment and money in case of any earth fault.
What is the difference between capactive voltage transformer and potential transformer?
A capacitive voltage transformer (CVT) uses a (usually two) stacks of capacitors to reduce the votlage to a smaller internal potential transformer (PT). This makes them less expensive than an equivalent PT, but there can be a loss of accuracy.
