A transformer step-down with turns ratio 6:1 reduces the voltage by a factor of 6; if the primary is 480 V, the secondary would be

A transformer step-down with turns ratio 6:1 reduces the voltage by a factor of 6; if the primary is 480 V, the secondary would be

• A. 80 V
• B. 480 V
• C. 960 V
• D. 160 V

Answer: (A)

A transformer with a 6:1 turns ratio steps the voltage down to one-sixth of the primary. Since Vs = Vp × (Ns/Np) and Ns/Np = 1/6, the secondary voltage is 480 V × 1/6 = 80 V. So the secondary would be 80 V. The other values would require different ratios or reversing the ratio (for example, 960 V would be if the secondary were stepped up, and 160 V would come from a 3:1 ratio).

A transformer with a 6:1 turns ratio steps the voltage down to one-sixth of the primary. Since Vs = Vp × (Ns/Np) and Ns/Np = 1/6, the secondary voltage is 480 V × 1/6 = 80 V. So the secondary would be 80 V. The other values would require different ratios or reversing the ratio (for example, 960 V would be if the secondary were stepped up, and 160 V would come from a 3:1 ratio).