Question:
The basic function of a transformer is to change
The basic function of a transformer is to change
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Remember the phrase: "Transformers are constant frequency devices." This is a very common trap in exams!
Updated On: Jul 1, 2026
- The level of the voltage
- The power level
- The power factor
- The frequency
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The Correct Option is A
Solution and Explanation
A transformer is a static electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.
1. Purpose of a Transformer:
The primary purpose is to "Step Up" (increase) or "Step Down" (decrease)
AC voltage levels while maintaining the same frequency. This is vital for efficient long-distance power transmission.
2. What stays Constant? An ideal transformer is a constant-power and constant-frequency device.
• Power: $P_{in} \approx P_{out}$. If voltage increases, current must decrease to keep power constant.
• Frequency: The frequency of the output AC is identical to the input AC.
3. Summary of Function: The transformer changes the "impedance" of the load and the "level of voltage/current," but it never changes the frequency or the total power (excluding minor losses). Therefore, changing the level of voltage is its most basic function.
AC voltage levels while maintaining the same frequency. This is vital for efficient long-distance power transmission.
2. What stays Constant? An ideal transformer is a constant-power and constant-frequency device.
• Power: $P_{in} \approx P_{out}$. If voltage increases, current must decrease to keep power constant.
• Frequency: The frequency of the output AC is identical to the input AC.
3. Summary of Function: The transformer changes the "impedance" of the load and the "level of voltage/current," but it never changes the frequency or the total power (excluding minor losses). Therefore, changing the level of voltage is its most basic function.
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