How Does Load Current Influence the Voltage Across a Battery's Terminals?

[Cici2017]

Homework Statement

Please provide a physics explanation of this question:
How does load current affect the potential difference across the terminals of a cell?

Homework Equations

The Attempt at a Solution

p.d. inversely proportional to current. Thus, when I increase, the p.d. decrease and vice versa

Is this a good enough 'physics explanation' for this question? Thanks~

 

[phinds]

Is this a good enough 'physics explanation' for this question? Thanks~

No, it is not because in an ideal power source it is not true so you need to explain why it IS true (and preferably also to what extent it is true) in a real power source.

 

[Cici2017]

No, it is not because in an ideal power source it is not true so you need to explain why it IS true (and preferably also to what extent it is true) in a real power source.

I don't know why is it true...

 

[Nidum]

An ideal cell maintains terminal voltage independent of load current . In a real cell the terminal voltage drops as load current increases .

What common electrical component could you put in series with an ideal cell so that the ideal cell and the additional component together behave like a real cell ?

Edit : Haven't you essentially got the answer to this question in your previous posting?

https://www.physicsforums.com/threads/internal-resistance-of-a-cell.921160/

 

[David Lewis]

Voltage times current gives power, but to answer this question, you'll need Ohm's Law.

 

[scottdave]

Edit : Haven't you essentially got the answer to this question in your previous posting?

https://www.physicsforums.com/threads/internal-resistance-of-a-cell.921160/

It seems that question was more asking about when a cell is getting used up. But yes, @Cici2017 does seem to demonstrate knowledge that battery cells do have an internal resistance.