Transformer Turns Ratio

For an ideal transformer: Vₛ/Vₚ = Nₛ/Nₚ where: `Vₚ` = primary voltage `Vₛ` = secondary voltage `Nₚ` = primary turns `Nₛ` = secondary turns

If: **Nₛ > Nₚ then: Vₛ > Vₚ**

If: **Nₛ < Nₚ then: Vₛ < Vₚ**

Primary voltage: `Vₚ = 20 V` Primary turns: `Nₚ = 100` Secondary turns: `Nₛ = 500` Then: `Vₛ/20 = 500100 = 5` So: **Vₛ = 100 V**

For an ideal transformer: **VₚIₚ = VₛIₛ** so increasing voltage results in decreasing current.