Transformer rating

Discussion in 'Homework Help' started by etech7, Jun 26, 2015.

Jun 9, 2015
33
0
Hi there,
I need an answare.
I have a transformer. It's rating is 250V, 12-0-12V, 5Amp. So it has two possible power rating. It might be 12x5=60VA or 24x5=120VA. Which rating is correct?

2. DickCappels Moderator

Aug 21, 2008
3,916
1,082
I think that is with a 24 volt center-tapped secondary, so the VA rating would be 5A x 24V maximum = 120 VA. If your transformer has an E-I core and weighs near 2.55 pounds (1.2 kg for the "civilised world or about 1.5 kg for a toroid, then I would take that as confirmation.

Jun 9, 2015
33
0
yap! it is 24v with center-tapped. it is built with E-I core also. Dimension is 68x45x58 mm². i m not sure about weight. it may b arround 1kilo. here i upload a pic of it.

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4. DickCappels Moderator

Aug 21, 2008
3,916
1,082
Then I guess we know what it is now.

Jun 9, 2015
33
0
any guess about it's va rating?

6. DickCappels Moderator

Aug 21, 2008
3,916
1,082
For its type of construction the weight is consistent with your calculation for 120 VA.

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