What is transducer ? How is it used ?

Explanation

### Step-by-Step Solution:

1. **Definition of Transducer**:
- A transducer is a device that converts one form of energy into another form. This is the fundamental characteristic of a transducer.

2. **Types of Energy Conversion**:
- Transducers can convert various types of energy, such as:
- Mechanical energy to electrical energy
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