Question

Assertion (A): The efficiency of a transformer is never 100%.

Reason (R): The energy is lost because of resistances of primary and secondary coils and eddy currents produced in core.

Options

• Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

• Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).

• Assertion (A) is false, but Reason (R) is true.

• Assertion (A) is true, but Reason (R) is false.

Answer 1

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

Explanation:

The assertion is true because in a transformer, some energy is always lost. The reason is also true because the resistance of the primary and secondary coils produces heat losses, and eddy currents produced in the soft iron core also waste energy. Since the output power is less than the input power, the efficiency can never be 100%. Thus, the reason correctly explains the assertion.