Difference Between Ammeter and Galvanometer
by Yogi P - October 28, 2023
Difference Between Ammeter and Galvanometer | Ammeter vs Galvanometer
Ammeters and galvanometers are both instruments used to measure electric current, but they differ in their design, purpose, and functionality. Understanding the distinctions between ammeters and galvanometers is crucial for accurate current measurement and their appropriate use in different applications. Let’s explore these differences.
What is Ammeter?
Ammeters are devices designed to measure the electric current flowing through a circuit. They are typically connected in series with the circuit under test, allowing them to measure the current passing through the entire circuit. Here are the key characteristics and applications of ammeters:
| Aspect | Ammeter |
|---|---|
| Measuring Current Type | Measures electric current (in amperes or amps). |
| Connection in Circuit | Connected in series with the circuit under test. |
| Purpose | Designed for accurate current measurement in a circuit. |
| Display | Typically calibrated to display current values directly. |
| Range Selection | May have multiple current range settings for various applications. |
Ammeters are essential instruments for electrical engineers, technicians, and anyone working with electrical circuits to measure current accurately.
What is Galvanometer?
Galvanometers are sensitive devices used to detect and measure small electric currents. They were historically used in various applications, including early telegraph systems. Here are the primary characteristics and applications of galvanometers:
| Aspect | Galvanometer |
|---|---|
| Measuring Current Type | Originally designed to detect and measure small currents. |
| Connection in Circuit | Often connected in parallel with a known resistance (shunt) to measure current. |
| Purpose | Primarily used for qualitative detection of current or as a component in more complex instruments. |
| Display | Typically provides deflection of a pointer on a scale, indicating current presence. |
| Range Selection | Limited range, not suitable for precise current measurement. |
Galvanometers are more sensitive to small currents and are often used in scientific and educational settings for qualitative demonstrations.
Key Differences:
- Measuring Current Type:
- Ammeters measure electric current in amperes (amps).
- Galvanometers were originally designed to detect and measure small currents qualitatively.
- Connection in Circuit:
- Ammeters are connected in series with the circuit to measure the current flowing through it.
- Galvanometers are often connected in parallel with a known resistance (shunt) to measure current.
- Purpose:
- Ammeters are designed for accurate and quantitative current measurement.
- Galvanometers are primarily used for qualitative detection of current or as a component in more complex instruments.
- Display:
- Ammeters are calibrated to directly display current values.
- Galvanometers typically provide deflection of a pointer on a scale to indicate the presence of current.
- Range Selection:
- Ammeters may have multiple current range settings to cover various applications.
- Galvanometers have a limited range and are not suitable for precise current measurement.
Conclusion
In summary, ammeters are specifically designed for accurate current measurement, while galvanometers are more sensitive and used for qualitative detection of current or as components in more complex instruments. Understanding their differences is crucial for selecting the right instrument for your specific current measurement needs.
