The working of dynamo is based on principle of

Options

A. Electromagnetic induction
B. Conversion of energy into electricity
C. Magneting effects of current
D. Heating effects of current

Explanation

### Step-by-Step Solution:

1. **Understanding the Dynamo**: A dynamo, also known as a DC generator, is a device that converts mechanical energy into electrical energy.

2. **Identifying the Principle**: The working of a dynamo is fundamentally based on the principle of electromagnetic induction. This principle states that a change in magnetic flux through a coil induces an electromotive force (EMF) in the coil.

3. **Mechanism of Operation**:
- When a coil is rotated in a magnetic field, it experiences a force due to the magnetic field.
- This rotation of the coil generates an induced EMF, which leads to the flow of electric current.

4. **Energy Conversion**: The dynamo converts mechanical energy (from the rotation of the coil) into electrical energy (the induced EMF). This is a direct application of Faraday's law of electromagnetic induction.

5. **Conclusion**: Therefore, the correct answer to the question is that the working of a dynamo is based on the principle of electromagnetic induction.