I have exactly until Friday to build(help build) a project for my daughter that is in 4th grade. The project is energy transformation.

I am thinking of letting her build a small low voltage transformer.

This will have to be a DC type trans.

I am thinking of using a 1.5V D cell battery for the primary and having a secondary output of around 12V, to run an automotive type bulb like an 1156.

If my calculations are correct then it would call for an 8:1 turns ratio.

What tpe of wire would I need and what should I use for a core? How many actual turns would I need? Obviusly 1 turn and 8 turns is not going to work.

Any help or direction to a website that has something you think would help my daughter would greatly be appreciated.

thanks glenn35