Question
What is the output voltage if an input signal is applied to the secondary winding of a 4:1 voltage step-down transformer instead of the primary winding?
Answer Options
- A) The input voltage is multiplied by 4
- B) The input voltage is divided by 4
- C) Additional resistance must be added in series with the primary to prevent overload
- D) Additional resistance must be added in parallel with the secondary to prevent overload
Correct Answer: A
Explanation
A transformer’s voltage ratio is determined by its turns ratio (N_p/N_s). A 4:1 voltage step-down transformer has a primary winding (N_p) with 4 times the number of turns as the secondary winding (N_s). The ratio of voltage is V_p/V_s = N_p/N_s.
If the input voltage is applied to the secondary (the side with fewer turns) and the output is taken from the primary (the side with more turns), the transformer is now acting as a step-up transformer. The output voltage will be multiplied by the turns ratio (4:1). Thus, the input voltage is multiplied by 4.
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