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Which of the following statement regarding transformer is incorrect?

1. A transformer makes use of Faradays Law.
2. The ferromagnetic properties of an iron core is used by it to efficiently raise or lower AC voltage
3. It cannot increase power so that if the voltage is raised, the current is proportionally lowered and vice versa.
4. The current induced in primary circuit is of same nature as in secondary circuit with differences in amplitude only.

Correct answer: The current induced in primary circuit is of same nature as in secondary circuit with differences in amplitude only.

Solution

The current in the primary and secondary circuits of a transformer differs not only in amplitude but also in phase, making the statement incorrect.

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