An ideal step-down electrical transformer has 800 turns in its primary coil and 40 turns in its secondary coil. If the primary alternating voltage is 240 V, what is the secondary output voltage?
Answer and explanation
Correct answer: B. 12 V
- Step 1: Apply the transformer voltage equation: V_s / V_p = N_s / N_p.
- Step 2: Substitute given values: V_s / 240 V = 40 / 800 = 1 / 20.
- Step 3: Solve for secondary voltage: V_s = 240 V * (1 / 20) = 12 V.
Answer
12 V.
Why not the others: '48 V' multiplies by 40 / 200; '24 V' calculates 240 / 10; '4800 V' inverts the turns ratio, treating the step-down unit as a step-up transformer.
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