I have a 220/110 transformer rated at 1 KVA.?

Question

What is the formula for working out how many amps it can handle.
and how many amps can it handle

Answer 1

The full formula would have to include the RMS voltage. But if you want a _very simple_ Ball park figure_ idea of the current capacity it is 1000/220 current input and 1000/110 current output.
or 4.5 amps on the input side and 10 amps on the output side

so, a 13 amp fuse on the input should be OK

Answer 2

For most purposes 1 KVa =1KW. Amps = Watts divided by Volts so you have 1000 watts divided by 220 volts which gives about 4 amps input and about double that on the output side. This means you can draw 8 amps on the output side. Limit it to that as the efficiency needs to be taken into account. I would fuse the input side at 3 amps if it is in continuous use but would risk 5 amps for intermittent use.

Answer 3

1KVA = 1000
voltage is 220. KVA = Voltsxamps
therefore 1000=220xI(amps)
I = 1000 divided by 220=4.5amps

Answer 4

If its a tool/site transformer it will have a 25% duty cycle you can use it for 5 minutes and "rest" the transformer for 15 minutes at 1000watt otherwise it will overheat(220v @ 4.5amp /110 v @ 9amp). For continuous use the rating is 60% of the rating on the transformer i.e. 600watt (220v @ 2.7amp/110 v @ 5.5amp)

Answer 5

it will draw 9.09 amps at 110 VAC or 4.45 amps at 220 VAC devide the input voltage by the KVA(1000 VA) and there is your answer. Paul

Answer 6

1000 VA
1000 Volt (ampere)
V=IR
I=V/R

P=IV
I = 1000/220 = 4.54 A at the input
I = 1000/110 = 9.09 A at the load side

Answer 7

The first two answers are correct, but if you intend to use the full output check the rating. It may be a 'Tool' transformer which will not be continuously rated and will overheat.

Answer 8

1kva Transformer