## A transformer is used to convert 120 V to 15.7 V in order to power a toy electric train.?

Question by : A transformer is used to convert 120 V to 15.7 V in order to power a toy electric train.?
If there are 214 turns in the primary, how many turns should there be in the secondary?

use V1/V2 = n1/n2

where V1 = 120 V, V2 = 15.7 V, and n1 = 214 turns

so n2 = n1 V2/V1

…… = 214*15.7/120

n2 = 28 turns, number of turns in the secondary

Hope this helps

Posted on Categories Electric Trains

## A transformer is used to convert 120 V to 8.6 V in order to power a toy electric train. If there are 260 turns

Question by Australianhotti: A transformer is used to convert 120 V to 8.6 V in order to power a toy electric train. If there are 260 turns
A transformer is used to convert 120 V to 8.6 V in order to power a toy electric train. If there are 260 turns in the primary, how many turns should there be in the secondary?

The voltage ratio is the same as the turns ratio. So the easiest solution is:
120/8.6 = 260/X whoops I got the X on the bottom, no problem
8.6/120 = X/260 and X = 8.6*260/120
= 18.63 turns
actually you would probably put 19 turns as a practical matter.