A transformer with 100 turns primary and 200 turns secondary, 600 VA rating, 120 V input, what will be the output voltage and current?

A transformer with 100 turns primary and 200 turns secondary, 600 VA rating, 120 V input, what will be the output voltage and current?

• A. 120 V and 5 A
• B. 240 V and 2.5 A
• C. 240 V and 2 A
• D. 160 V and 3.75 A

Answer: (B)

A transformer’s output voltage scales with the turns ratio. Here the primary has 100 turns and the secondary 200 turns, so the turns ratio is 2:1 in favor of the secondary. That means the secondary voltage is twice the primary, giving 120 V × 2 = 240 V. The transformer rating is 600 VA, which limits how much power it can deliver. With a secondary voltage of 240 V, the maximum secondary current is 600 VA ÷ 240 V = 2.5 A. (At full load, the primary would draw 5 A to match this, consistent with the turns ratio.) So the output is 240 V and 2.5 A.

A transformer’s output voltage scales with the turns ratio. Here the primary has 100 turns and the secondary 200 turns, so the turns ratio is 2:1 in favor of the secondary. That means the secondary voltage is twice the primary, giving 120 V × 2 = 240 V.

The transformer rating is 600 VA, which limits how much power it can deliver. With a secondary voltage of 240 V, the maximum secondary current is 600 VA ÷ 240 V = 2.5 A. (At full load, the primary would draw 5 A to match this, consistent with the turns ratio.)

So the output is 240 V and 2.5 A.