On 12/16/2013 07:01 AM, Leif Neland wrote:
micky forklarede den 16-12-2013:
Someone on Freecycle is giving away an autotransformer. with
220/240-volt input and single 110-120-volt output. 1-Amp fuse. Made in
England.

Do I have any use for that for repair work or anything? Since there
is already 120 in the house, I don't think so, but in the picture it
looks like new. ;-)
What are they used for?

In civilized countries with a modern electric system, we have 230v,
allowing for using less copper/alu in the cables.

When we get equipment from backward countries with only 110v, we use an
autotransformer to step down the voltage.

An autotransformer use less wire than a "normal" transformer, but does
not give isolation between primary and secondary.

Leif

... with 230 and 400v in the house.



Pretty useless in the shop here. Trade it for a dim bulb tester.