What happens when we connect 2 batteries + with +, - with -?

Click For Summary

Homework Help Overview

The discussion revolves around the connection of two batteries with their positive terminals connected to each other and their negative terminals connected to each other. The subject area includes concepts of electrical circuits and battery properties.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the implications of connecting batteries in parallel, questioning whether any changes occur in voltage, current, or capacity. Some express uncertainty about the properties of the resulting battery pair compared to a single battery.

Discussion Status

The discussion is ongoing, with participants offering various interpretations of the effects of connecting batteries in this manner. Some guidance has been provided regarding the conceptual nature of the question, but no consensus has been reached on the specific outcomes or properties of the battery pair.

Contextual Notes

Participants note that the batteries are assumed to be of the same voltage, and there is a focus on understanding the implications of this assumption in relation to the properties of the connected batteries.

CasterlyRock
Messages
6
Reaction score
0

Homework Statement


Batteries are connected together with their + and - poles.

Homework Equations



The Attempt at a Solution


I quess that nothing happens because there is no change in potential difference.
 
Last edited:
Physics news on Phys.org
Exactly. Assuming of course that the two batteries do have the same voltage, nothing will happen. (If you connect them + to - and - to +, the two batteries will quickly drain and the wires connecting them may over heat. Not a good thing to do!)
 
CasterlyRock said:
I quess that nothing happens because there is no voltage difference.
Sounds reasonable. Are you possibly also supposed to make an observation about the properties of the resulting battery pair?
 
No, it only says that batteries are the same.
 
CasterlyRock said:
No, it only says that batteries are the same.
I meant properties of the pair after connection compared to a single battery. Volts? Amps? Amp-hour capacity?
 
insightful said:
I meant properties of the pair after connection compared to a single battery. Volts? Amps? Amp-hour capacity?
Really nothing except what I wrote. The question has a conceptual nature. I assumed that when connected, batteries are in parallel, that means the same potential as it was, so nothing changes.
 
Could you not say that you produced a "new" battery with the same volts, but twice the amp and amp-hour capacity?
 
insightful said:
Could you not say that you produced a "new" battery with the same volts, but twice the amp and amp-hour capacity?
I don't understand. Do you mean if I would apply a resistor to that new one battery (lets say a resistor is a lightbulb) it would shine brighter than one applied to the original battery?
 
CasterlyRock said:
I don't understand. Do you mean if I would apply a resistor to that new one battery (lets say a resistor is a lightbulb) it would shine brighter than one applied to the original battery?
Why would it shine brighter with the same volts applied?
 
  • #10
P=I^2*R. You've said that amp is greater than before.
 
  • #11
CasterlyRock said:
P=I^2*R. You've said that amp is greater than before.
No, I said the amp capacity is greater than before. How much greater?
 

Similar threads

  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 10 ·
Replies
10
Views
2K
Replies
4
Views
2K
Replies
5
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
Replies
8
Views
2K
  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 7 ·
Replies
7
Views
2K
Replies
2
Views
2K
Replies
3
Views
2K