(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Three identical batteries, with finite internal resistance, are connected in series in a closed loop. (Positive Terminal of battery 1 to Negative Terminal of battery 2; Positive Terminal of battery 2 to Negative Terminal of battery 3; Positive Terminal of battery 3 to Negative Terminal of battery 1.) What reading will a voltmeter register if it is connected in parallel across one of the cells, and all the connecting wires have negligible resistance? What will happen to the voltmeter reading if the number of batteries is increased and the connection points of the voltmeter remain the same?

2. Relevant equations

Kirchoff's rule:

[tex] \sum Voltage = 0 [/tex]

3. The attempt at a solution

Using Kirchoffs Rule,

[tex] \epsilon_{battery 1} + \epsilon_{battery 2} + \epsilon_{battery 3} = 0 [/tex]

[tex] I_1r_1 + I_2r_2 + I_3r_3 = 0 [/tex]

But since the batteries are all the same, the current flowing through them would surely be equal, thus meaning that the only way to satsify this current would be to have 0 current flow, and hence no voltage? And thus for the second part, adding more batteries wouldn't make any difference?

Is this the right explanation?

???

TFM

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Batteries connected in Empty Circuit

**Physics Forums | Science Articles, Homework Help, Discussion**