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Oil is used to cool the transformer. There is no telling what the transformer in question uses without knowing the specific part number and looking up the specification.

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Q: How many gallons of oil in a 2500 kva 12470 480 volt transformer?
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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 many amps does a 600 watt low voltage transformer box pull?

The transformer itself does not pull current. Whatever you connect to the transformer pulls current. Whatever the output voltage of the transformer is, divide that into 600 and you get maximum current possible without burning up the transformer. At 24V that's 25 amps.


How many 12V 50W bulbs can you run on a 20-60VA transformer?

A 60VA transformer can run only one 50W bulb.


How many number of magnetic paths in a berry type transformer?

1


Why a two winding transformer is used instead of single winding transformer?

You need two windings because that is the purpose of the transformer - to convert one voltage into another. If there were only one winding, it would be an inductor, or a special case called an autotransformer, but that is still "sort of" two windings.AnswerThe major advantage of a two-winding transformer (a 'mutual transformer') over a single-winding transformer (an 'autotransformer') is that a two-winding transformer provides electrical isolation between the secondary and primary circuits. This is very important for safety reasons and there are many circumstances in which the use of an autotransformer is not permitted.