Question

Any device that converts one form of energy into another is termed as
(A) amplifier
(B) transducer
(C) receiver
(D) demodulator

Answer 1

Hint: -
The law of conservation of energy states that energy can neither be created nor be destroyed but it can be converted from one form of energy into another and there are many applications of this law. In electric motors, electrical energy is converted into mechanical energy.

Complete Step by Step Solution:
Here we need to name the device which converts one form of energy into another. Let us examine each option in detail. An amplifier is a device which is used to amplify a given electric signal so that it can be transmitted up to a long distance. The second option is a transducer which is an electronic device that converts energy from one form to another. Now looking at the other two options. The other two options remaining are the receiver and the demodulator. Demodulator works to recover the information content from the modulated carrier wave and the receiver is used to receive the information sent by the antenna. So, out of all given options transducer fits in the demand of the question.
Hence, the correct option is (B).

Note:
Examples of transducer includes microphones, photocells etc. while designing the transducer an important point to keep in mind is the efficiency. Efficiency is defined as the ratio of output to the input. Greater efficiency means greater output. Transducer efficiency is defined as the ratio of the power output in the desired form to the total power input.