What is the apparatus used in measuring the electric current ?

Options

A. Barometer
B. Altemeter
C. Ammeter
D. Anemometer

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the apparatus used to measure electric current.

2. **Identifying Options**: The options provided are:
- Barometer
- Altimeter
- Ammeter
- Thermometer

3. **Analyzing Each Option**:
- **Barometer**: This instrument measures atmospheric pressure. It is not related to electric current.
- **Altimeter**: This device measures altitude, typically used in aviation. It does not measure electric current.
- **Ammeter**: This is the device specifically designed to measure electric current in a circuit.
- **Thermometer**: This instrument measures temperature, which is also unrelated to electric current.

4. **Conclusion**: After analyzing the options, it is clear that the correct apparatus for measuring electric current is the **Ammeter**.

5. **Final Answer**: The apparatus used in measuring electric current is the **Ammeter**.

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