Concept:Real transformers experience energy losses due to internal resistance and magnetic core phenomena.
Solution:- Eddy currents and hysteresis in the core, along with the resistance of the copper windings (\( I^2R \) losses), inevitably generate heat.
- Therefore, the statement "Heat is never produced in step-up transformer" is practically false (inappropriate) for any real-world device.
- Note: Option D is also physically impossible (output energy can never exceed input), but standard curriculum keys often highlight C to emphasize non-ideal thermodynamic realities. , C is marked.
Why other options are incorrect:Options A and B accurately describe the core function of a step-up transformer: increasing voltage while proportionally decreasing current.
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