I''What is the optimal resistance for maximizing battery terminal voltage?

AI Thread Summary
To maximize the terminal voltage of a battery with emf V and internal resistance r, the optimal external resistance R must be determined. The discussion presents three options for R: R = r, R = 4r, and R = r/4. The equation V = IR is referenced, along with the equivalent resistance Req = r + R. The goal is to find the value of R that results in a terminal voltage of V/2. Further clarification is needed, as an image intended to support the explanation did not upload successfully.
Alice7979
Messages
36
Reaction score
2

Homework Statement


A battery has an emf of V and an internal resistance of r. What resistance R, when connected across the terminals of this battery, will cause the terminal voltage of the battery to be
session.quest2951396entrance1_N1002E.mml
?
A. r= R
B. R= 4r
C. R= r/4

Homework Equations


V=IR

The Attempt at a Solution


Req= r+R
= V/I' + V/I''
= ? + V/2I''
 
Physics news on Phys.org
Alice7979 said:
will cause the terminal voltage of the battery to be
session.quest2951396entrance1_N1002E.mml
?
The image did not appear to upload... Can you try again? Use the UPLOAD button to upload a PDF or JPEG image.
 
It was supposed to be V/2
 
Thread 'Struggling to make relation between elastic force and height'
Hello guys this is what I tried so far. I used the UTS to calculate the force it needs when the rope tears. My idea was to make a relationship/ function that would give me the force depending on height. Yeah i couldnt find a way to solve it. I also thought about how I could use hooks law (how it was given to me in my script) with the thought of instead of having two part of a rope id have one singular rope from the middle to the top where I could find the difference in height. But the...
Thread 'Voltmeter readings for this circuit with switches'
TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
Back
Top