Variable Resistors in a Voltage Divider

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SUMMARY

Using variable resistors (potentiometers) in both positions of a voltage divider is inadvisable due to the risk of creating a short circuit. When both potentiometers are set to zero ohms, it can lead to excessive current draw, potentially damaging the power source. The textbook emphasizes that employing a variable resistor in only one position is acceptable, as it mitigates the risk of shorting the circuit.

PREREQUISITES
  • Understanding of voltage dividers and their configurations
  • Knowledge of potentiometers and their function in circuits
  • Basic principles of electrical resistance and current flow
  • Familiarity with circuit protection mechanisms
NEXT STEPS
  • Research the effects of short circuits in electrical circuits
  • Learn about safe potentiometer configurations in voltage dividers
  • Explore circuit protection methods to prevent damage from excessive current
  • Study the characteristics of different types of resistors and their applications
USEFUL FOR

Electronics enthusiasts, electrical engineers, and students studying circuit design who want to understand the implications of using variable resistors in voltage dividers.

PsychonautQQ
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My textbook says that in a voltage divider (voltage source Vin, then a resistor, then another path that leads to Vout, Resistor two, Ground, that it is a bad idea to use variable resistors for BOTH of the resistors (but it is okay if you just do one or the other). Does anybody know why?
 
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PsychonautQQ said:
My textbook says that in a voltage divider (voltage source Vin, then a resistor, then another path that leads to Vout, Resistor two, Ground, that it is a bad idea to use variable resistors for BOTH of the resistors (but it is okay if you just do one or the other). Does anybody know why?

What happens if both potentiometers are set to zero?
 
With 2 variable resistors there is a possibility of having 0 ohms resistance, this could damage your power source.
 

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