In a practical transformer mutual induction between primary and secondary coils takes place. In such transformer what can be deduced about the power.
Correct answer: D. Power output < Power input
- A. Power output = Power input
- B. Power output > Power input
- C. Power output ≥ Power input
- D. Power output < Power input
Explanation
The output power in a transformer is always less than the input power because of the different losses in a transformer. The losses may be Iron loss or core loss, hysteresis loss, eddy current loss, copper loss etc.
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Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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