GATE 2023 IN – Question 34
The full-scale range of the wattmeter shown in the circuit is 100 W. The turns ratio of the individual transformers are indicated in the figure. The RMS value of the ac source voltage Vs is 200 V. The wattmeter reading will be __________W (rounded off to the nearest integer).
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Correct answer: 0 to 0
Explanation
Both ideal transformers isolate their primary and secondary circuits galvanically. The current coil is the sole connection between the otherwise isolated first-secondary and source-return circuits, so it has no closed current path. With zero current-coil current, the wattmeter reads **0 W**, regardless of its potential-coil voltage.