Does Battery Internal Resistance Vary with External Resistance?

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Discussion Overview

The discussion revolves around whether the internal resistance of a battery varies with external resistance and under what conditions this might occur. Participants explore the nature of internal resistance in batteries, considering factors such as battery chemistry, design, temperature, and state of charge.

Discussion Character

  • Debate/contested
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • Some participants assert that the internal resistance of a battery is not variable and does not depend on external resistance.
  • Others suggest that internal resistance may depend on factors such as battery chemistry, design, temperature, and state of charge.
  • One participant notes that internal resistance is generally considered constant over a typical discharge cycle but can increase with battery aging and decreasing temperature.
  • There is a question regarding the source of information for claims made about internal resistance.
  • One participant clarifies that their inquiry is not related to homework but stems from curiosity about the topic.

Areas of Agreement / Disagreement

Participants express differing views on whether internal resistance is variable, with some asserting it is constant while others propose that it can change under certain conditions. The discussion remains unresolved regarding the dependence of internal resistance on external factors.

Contextual Notes

Participants mention various factors that could influence internal resistance, such as battery aging and temperature, but do not reach a consensus on the overall variability of internal resistance in relation to external resistance.

waqarrashid33
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Is the internal resistance of the battery or other source is variable or not?
without discharging .
Is it depend upon on the external resistance?
 
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waqarrashid33 said:
Is the internal resistance of the battery or other source is variable or not?
without discharging .
Is it depend upon on the external resistance?

No, the internal resistance of a battery is not variable.. and it also does not depend on the external resistance.
 
blitz.km said:
No, the internal resistance of a battery is not variable.

What's your source of information?
 
Probably depends on battery chemistry, design, temperature, and state of charge.

Bob S
 
The internal resistance is normally taken as sensibly constant over one cycle of the normal discharge range of current.

The internal resistance does, however increase with ageing of the battery so the internal resistance after 500 cycles of a rechargeable has often increased enough to render the battery useless.

The internal resistance is independent of other circuit configurations, so long as the currents drawn are within the normal ratings.

The internal resistance increases with decreasing temperature, which is why it is harder to start a vehicle on a cold morning.

Is this a homework question?
 
No this is not home working question.
there is no information about the internal resistance in our course bot this question arise in mind and so i do it here
 
It's good to think around the subject. Hope my initial reply helped.
 
Phrak said:
What's your source of information?

the experiments done in my school lab.
 

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