Making a transformer as an experiment

hello!
i thinking making basic transformer possible experiment. first, want find out if possible or not. have small cardboard tube , magnum wire. make 100 coils of wire on tube, , secure clear tape. then, make 50 coils on top of first coil separate wire, , secure that. if power primary coil of 100 coils oscillating dc current of 9v, 4.5v generated in second coil (step down transformer)? 50-coil used primary instead, voltage stepped 18v?
thanks!

quote

with oscillating dc current...

in case, wouldn't dc.    can run square-wave through transformer, don't square wave out of secondary.

you may able make "works", it's not easy make efficient-usable transformer. 

with 100 turns, won't have inductance , dc resistance low.   at low frequencies (say 50hz or 60hz power-line frequency) you'll current through primary coil.   if have high-frequency oscillator, experiment that, still idea limit current, if don't have way of measuring inductance.   (if limit current, limiting voltage.)

if want make transformer, i'd suggest winding coils around bolt or iron rod.    you'll still have limit current (at lower frequencies), probaby measure step-up voltage (with no load).   maybe @ frequency of 100khz, useful results that's wild guess , don't know.

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