# Same length insulated wire small gauge vs larger gauge

I'm doing an school experiment with my daughter and I made two alternating current generators. One is a coil of 22 gauge wire and the other is a coil of 28 gauge wire where we rub a strong block of neodymium magnet across.

The coil that has thinner wire produces more voltages and more current and lights the small led light bulbs brighter(about 2.7 volts, 0.201 amps, 47 ohms resistance when measured at the two leads after the coils)

and the one that has thicker wire produces less volts and less current and less resistance.(about 1.1 volts, and 0.181 amps, 8.3 ohms)

Both coils are made up of about 500 feet of insulated wire.

I initially thought that the one with thicker wire would produce more voltages or in any case more amps. But that wasn't the case, does anyone know why?

I've added a photo of the configuration for more clarity.

• At the current levels you're dealing with the difference in resistance between the two is negligible. Oct 13, 2019 at 2:33
• Do the two coils have the same number of loops of wire? I would expect thicker wire might have fewer loops which would result in a smaller induced voltage. Oct 13, 2019 at 3:37