An ideal transformer is one in which
- A. the output power equals the input power
- B. the output voltage equals the input voltage
- C. the output current equals the input current
- D. no flux passes through the core
Explanation
Ideal means lossless, so all the power delivered to the primary appears at the secondary, and voltage and current change in inverse proportion. Real transformers approach 98 per cent efficiency but lose a little to eddy currents, hysteresis, resistance in the windings and flux leakage. A transformer never changes the frequency.
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