Finding Voltage and Resistance in a Series Circuit

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Homework Help Overview

The discussion revolves around finding the voltage at a specific point in a series circuit with an initial voltage of 15V and a total resistance calculated as 100.05Kohm. Participants are exploring the relationships between voltage, current, and resistance in this context.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to understand how to find the voltage at the end of a series of resistors, questioning the static nature of voltage in series circuits. Some participants clarify that current remains constant throughout the circuit, while others inquire about calculating voltage at specific points.

Discussion Status

Participants are actively engaging with the problem, offering clarifications and resources. There is a mix of interpretations regarding the behavior of voltage and current in series circuits, and some guidance has been provided on measuring voltage drops to find resistance values.

Contextual Notes

The original poster expresses uncertainty about the behavior of voltage in series circuits and seeks clarification on the relationship between voltage, current, and resistance. There may be assumptions about the understanding of circuit principles that are being questioned.

tamz273
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Homework Statement


I need to find the VOLTAGE at the end of a series of resistors, where the initial voltage is 15V


Homework Equations


R = R1+R2+R3
I = V/R


The Attempt at a Solution


Total resistance = 100.05Kohm (R1+R2+R3)
I @ Va = 15/100.05 = 14.9mA

Now I don't know how to find the RESISTANCE at the end of the circuit (point Va)

Any help? I am not HORRIBLE with circuits, but isn't voltage static in a series circuit? and current changes? So shouldn't the Voltage be the same at the beginning and end of the series of resistors?! :S
 
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Actually, in a series circuit, all components carry the same current.
 
so how would i calculate the voltage at a certain point in the circuit?
 
tamz273 said:

Homework Statement


I need to find the VOLTAGE at the end of a series of resistors, where the initial voltage is 15V


Homework Equations


R = R1+R2+R3
I = V/R


The Attempt at a Solution


Total resistance = 100.05Kohm (R1+R2+R3)
I @ Va = 15/100.05 = 14.9mA

Now I don't know how to find the RESISTANCE at the end of the circuit (point Va)

Any help? I am not HORRIBLE with circuits, but isn't voltage static in a series circuit? and current changes? So shouldn't the Voltage be the same at the beginning and end of the series of resistors?! :S

15 volts / 100.05 ohms = .1499 amperes (which is 149.9 mA)

Since you know the current (correct current is .1499 amperes) flowing through ALL the series resistors, merely measuring the voltage drop across the resistor in question, then divide that voltage drop by your current of .1499 amperes and it will yield the resistance value of that resistor in ohms.
 

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