Is this true that a portable radio has a built-in step-down transformer that can be worked using mains instead of the battery?

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True

False

answer is A.

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Detailed Solution

The above statement is True.
A transformer is used to induce current from one coil to the secondary. Where the number of turns will help to determine whether the voltage is going to drop or step up. In radio, the voltage needed is less than the main voltage.
As the rectified DC voltage is equal to the battery voltage, it can operate on both the mains and the battery. The voltage from the mains is too high for the portable radio, so it must be stepped down. Transformers are widely used in a variety of radio and electronic applications. One of their primary applications is in power supplies.

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