In a step-up electrical transformer with 100 primary turns and 500 secondary turns, what is the output voltage if input is 230 V AC?
Answer and explanation
Correct answer: D. 1,150 V AC
- Step 1: Ideal transformer equation: V_s / V_p = N_s / N_p. Step 2. Here N_s / N_p = 500 / 100 = 5. Output voltage V_s = 5 230 V = 1,150 V. Answer: 1,150 V AC. Why not the others: Power is conserved (V_p I_p = V_s * I_s), so secondary current is one-fifth of primary current.
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