What number of turns on the secondary is needed to reduce th

What number of turns on the secondary is needed to reduce the voltage from 120 V to 9.0 V if there are 40 turns on the primary of a step down transformer?

3

9

18

120

530

Solution

V₂/V₁=N₂/N₁

N₁ repesents the number of turns in the primary = 40

N₂ repesents the number of turns in the secondary l =?

V₁ = 120

V₂ = 9

Therfore N₂=(N₁V₂₎/V₁

N₂=40x9/120

N₂=3