If we decrease the voltage passing through a circuit, (suppose that

Click For Summary

Discussion Overview

The discussion revolves around the effects of decreasing voltage in a circuit while keeping resistance constant, and the implications for current and resistance. Participants explore the relationships defined by Ohm's Law and the behavior of resistors in series and parallel configurations.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Homework-related

Main Points Raised

  • Some participants assert that decreasing voltage with constant resistance will likely lead to a decrease in current, referencing Ohm's Law (V = IR).
  • Others argue that while the equation holds, resistance is a fixed characteristic of the circuit that cannot change without modifying the circuit itself.
  • A participant inquires about the effects of removing a resistor from series and parallel configurations, prompting further explanation of the rules governing these arrangements.
  • Participants provide formulas for calculating total resistance in series and parallel but do not delve into specific calculations.

Areas of Agreement / Disagreement

There is some agreement on the application of Ohm's Law, but participants express differing views on the implications of resistance changes and the effects of removing resistors from circuits. The discussion remains unresolved regarding the broader implications of these concepts.

Contextual Notes

Participants do not fully explore the assumptions underlying their statements, such as the nature of the circuit or specific conditions under which resistance might change.

Who May Find This Useful

This discussion may be useful for individuals studying basic circuit theory, particularly those interested in the relationships between voltage, current, and resistance, as well as the behavior of resistors in different configurations.

poohbearhug
Messages
8
Reaction score
0
if we decrease the voltage passing through a circuit, (suppose that the amount of resistance encountered by the voltage remains the same/constant), the current passing through the circuit will be most likely to decrease as well. Similarly, if the voltage decreases (the current remains constant), the resistance is expecting to decrease also


IS THIS CORRECT? PLEASE HELP ME.
 
Physics news on Phys.org


if we decrease the voltage passing through a circuit, (suppose that the amount of resistance encountered by the voltage remains the same/constant), the current passing through the circuit will be most likely to decrease as well.

Yes, V = IR.

Similarly, if the voltage decreases (the current remains constant), the resistance is expecting to decrease also

While it's the same equation, it doesn't work that way. Resistance is a characteristic of the circuit you have, and you'll have to change the circuit in some way to change the resistance so as to be able to maintain the same current as voltage decreases.
 


poohbearhug said:
if we decrease the voltage passing through a circuit, (suppose that the amount of resistance encountered by the voltage remains the same/constant), the current passing through the circuit will be most likely to decrease as well. Similarly, if the voltage decreases (the current remains constant), the resistance is expecting to decrease also


IS THIS CORRECT? PLEASE HELP ME.

Welcome to the PF.

Correct so far. What is the context of your questions?
 


Thank you for that answer. I learned a lot. But I have one more question.

What will be the effect on each combination(series and parallel) of resistors if one of the resistors is removed? Why?
 


You know how resistors in series and parallel works, right?

R_total = R_1 + R_2... for series
1/R_tot = 1/R_1 + 1/R_2... for parallel

Remove a resistor in parallel, calculate change yourself.
Remove a resistor in series, circuit is now off.
 


thank you. i wish i could understand that.
 

Similar threads

  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 3 ·
Replies
3
Views
1K
  • · Replies 62 ·
3
Replies
62
Views
10K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 9 ·
Replies
9
Views
4K
  • · Replies 18 ·
Replies
18
Views
6K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 22 ·
Replies
22
Views
8K
  • · Replies 23 ·
Replies
23
Views
3K