how many turns are there in the output coil?

Question

The charger cord used to recharge a cell phone contains a transformer that reduces 120 V AC to 4 V AC. For each 1,225 turns in the input coil, how many turns are there in the output coil?

Answer 1

Hi Emma,

We have [voltage out] / [voltage in] = [turns on output coil] / [turns on the input coil].

So: 4V/120V = T/1225

T = 41

I hope this helps, Joe.