Will there be a difference between the readings of V1 and V2

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Homework Help Overview

The discussion revolves around the potential difference between the readings of two voltmeters, V1 and V2, in a circuit where current is divided at a junction. The context involves applying Ohm's law and understanding the behavior of voltage in parallel circuits.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore whether the readings of V1 and V2 would differ due to the division of current at point C. Some question the assumptions about voltage measurements in parallel configurations.

Discussion Status

Multiple perspectives are being explored, with some participants suggesting that the voltmeters will read the same due to the equipotential nature of the points they measure between. Others are examining the implications of current division and wire resistance on the readings.

Contextual Notes

There is an ongoing discussion about the assumptions regarding wire resistance and the physical layout of the circuit, which may affect the voltage readings. The lengths of the wires connecting the components are not specified, leading to different interpretations of the circuit's behavior.

prakhargupta3301
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6863cf61e66c06281ee19ad3297b7593.jpg

I= Current flowing
V1= Voltmeter 1
V2= Voltmeter 2

My question is that if there would be any difference between the readings of V1 and V2?
We know that: By Ohm's law: V= I.R
also:
Combined resistance of R1 and R2 will be:
1/RCombined Resistance of R1 and R2= 1/R1+1/R2
The reading in V2 will be : (V2= I. Combined resistance of R1 and R2)
But the current flowing in the circuit will get divided into two unknown parts at point C.
Now, if the current I is being divided, then the reading of V1 should be different than V2.
This is my problem please guide me.
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No. They will both give you a measurement equivalent to connecting the voltmeter between C and D.
 
Lines on a schematic diagram are considered equipotentials. That ought to answer your question ipso facto.
 
prakhargupta3301 said:
the current flowing in the circuit will get divided into two unknown parts at point C.
You can determine the ratio from the fact that the potential is the same, which means that...
prakhargupta3301 said:
if the current I is being divided, then the reading of V1 should be different than V2.
... no, it is divided in just such a way that V1and V2 are the same.
 
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If you calculate the value of current (I) delivered by the battery cell, this value will be split so that a certain portion goes through r1, and the rest of the current goes through r2. The voltage measurements as you have configured will be practically the same, since the resistance of the wire is very low, compared to the components in the circuit.
Refer to this table of wire resistances for typical sizes of copper wiring. If you are using 20 gauge wire, it will take 1000 feet of wire to result in 10 ohms of resistance. http://hyperphysics.phy-astr.gsu.edu/hbase/Tables/wirega.html
 
Another way of looking at it is to consider the length of the of wires. The length of A-C, C-E, B-D & D-F are not specified so they could have zero length. This would mean A and E are in the same physical and electrical place, B and F likewise. Then it's obvious V1 and V2 must be the same.
 

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