Physics - EMI/AC Question with Solution | TestHub
Assertion (A): A step-up transformer increases the power of an AC signal.
Reason (R): A transformer works on the principle of mutual induction and conserves energy.
Options:
Answer:
Solution:
A transformer is an energy-conserving device. In an ideal transformer, the power in the primary coil is equal to the power in the secondary coil ().
Therefore, a step-up transformer increases voltage but decreases current, keeping the power constant (ignoring losses). So, Assertion (A) is false.
Reason (R) is true. A transformer operates on the principle of mutual induction, where a changing magnetic flux in the primary coil induces an EMF in the secondary coil. Furthermore, it is designed to transfer electrical energy efficiently, implying energy conservation (though real transformers have some losses).
