The Difference between Potentiometer and Voltmeter – Which One to Use?
When it comes to measuring electrical signals, there are different types of instruments to choose from. Potentiometers and voltmeters are two such devices, often used in the field of electronics. While they may look similar, they operate quite differently and are meant to serve different purposes. In this article, we’ll discuss the basic differences between a potentiometer and a voltmeter and help you understand which one to use for an accurate measurement.
What is a Potentiometer?
A potentiometer, also known as a variable resistor, is a three-terminal device used to vary the resistance in an electrical circuit. It consists of a resistive element and a movable wiper that slides along the resistance track, allowing the user to adjust the output voltage. When you adjust the wiper, the output voltage changes proportionally to the resistance value. Potentiometers are commonly used in audio and lighting systems, as they allow users to control the volume or brightness of the system.
What is a Voltmeter?
A voltmeter is an instrument used to measure the electrical potential difference between two points in an electrical circuit. It works by connecting two probes to the circuit, across the two points you want to measure. The voltmeter then displays the potential difference (measured in volts) between the two points. Voltmeters are commonly used in electrical engineering and electronics to measure the voltage of batteries, circuits, and other types of electrical systems.
The Key Differences
Now that we have a basic understanding of what a potentiometer and a voltmeter are, let’s focus on the key differences between the two instruments.
The main difference lies in what they measure. Potentiometers measure the amount of resistance, while voltmeters measure the potential difference between two points. Potentiometers are used to control the output voltage, while voltmeters are used to measure it.
Another key difference is how they are used. Potentiometers are used to adjust the output voltage, while voltmeters are used to measure the voltage of a system. Potentiometers are often used in electrical systems that require fine-tuning or variable settings, while voltmeters are used for troubleshooting or testing purposes.
Choosing the Right Instrument
Choosing between a potentiometer and a voltmeter depends on what you’re trying to accomplish. If you want to control the output voltage, a potentiometer is the right choice. If you want to measure the voltage of a system, a voltmeter is the right choice.
When choosing a potentiometer, you need to consider the range of resistance and how smoothly the wiper moves along the resistor track. When choosing a voltmeter, you need to consider the range of voltage that you need to measure and the accuracy of the instrument.
In conclusion, understanding the differences between a potentiometer and a voltmeter is important for anyone interested in working with electrical systems. Knowing which instrument to use based on the specific needs of the project can help ensure accurate readings and optimal performance.
Table difference between potentiometer and voltmeter
| Feature | Potentiometer | Voltmeter |
|---|---|---|
| Measurement | Measures the potential difference between two points in a circuit | Measures the potential difference between two points in a circuit |
| Function | Used to control the amount of current flowing through a circuit or to adjust the resistance of a circuit | Used to indicate the amount of voltage in a circuit |
| Application | Used in volume controls of audio amplifiers, in tuning circuits of radios, in variable resistors, and in sensors to detect position, pressure, and temperature | Used in testing circuits and measuring voltages in electronic devices and appliances |
| Types | Wire-wound, carbon composition, cermet, multi-turn, and single-turn | Digital, analog, and precision voltmeters |
| Symbol |  |
 |