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Guilherme Mazui

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What is the Difference Between Potentiometer and Rheostat?

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A potentiometer and a rheostat are both types of variable resistors, but they have different functions and applications. The main differences between them are:

  1. Number of Terminals: A potentiometer has three terminals (input and 2 outputs), while a rheostat has two terminals (1 input, 1 output).
  2. Function: A potentiometer is used for voltage control, dividing the input voltage between its two outputs. In contrast, a rheostat is used for current control by modifying the resistance.
  3. Application: Potentiometers are commonly used in audio devices, while rheostats are used to monitor the flow of current within a circuit.
  4. Connection Type: Potentiometers are connected in parallel with the source, whereas rheostats are connected in series with the load.
  5. Accuracy: Potentiometers are more accurate in maintaining the ratio between two values when used as a voltage divider, while rheostats may not be as consistent in their absolute value tolerance.

In summary, potentiometers are three-terminal devices used for voltage control, while rheostats are two-terminal devices used for current control. They have different applications and connection types, and potentiometers are generally more accurate than rheostats in maintaining a consistent ratio between two values.

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  • What is the Difference Between Potentiometer and Rheostat?
  • Comparative Table: Potentiometer vs Rheostat

    • Comparative Table: Potentiometer vs Rheostat

    Here is a table comparing the differences between potentiometers and rheostats:

    Characteristic Potentiometer Rheostat
    Number of Terminals 3 2
    Function Voltage control Current control
    Operation Used as a voltage divider to adjust voltage in a circuit Used as a variable resistance to control current flow in a circuit
    Connection One end of the device is connected to a schematic, and the wiper is connected to one end or another Only the wiper and one other terminal are connected, with some connections between one end and the slider
    Commonly Used in Audio equipment, frequency setting in old radio setups Lighting systems, motor speed controllers, circuit flow control in scientific experiments
    Accuracy Potentiometers are more accurate due to their use as a ratio between two values Rheostats can be less accurate when used as a variable resistance

    In summary, potentiometers are typically used for voltage control, while rheostats are used for current control. Potentiometers have three terminals and are used as voltage dividers, while rheostats have two terminals and act as variable resistances in circuits.

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    Guilherme Mazui

    Guilherme Mazui is graduated in journalism from the Federal University of Minas Gerais (UFMG) and a master's degree in Communication from the University of São Paulo (USP). In addition, he has experience in advertising writing and has worked as a content editor in several companies.