What is the value of the load resistor?

Click For Summary

Homework Help Overview

The discussion revolves around determining the value of a load resistor in a circuit context, specifically involving a high voltage power supply with an internal resistance mentioned as 24 MΩ. Participants are exploring the implications of their calculations and the importance of units in their answers.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants are questioning the validity of the initial answer of 32 and later 72, discussing the significance of units in their calculations. There is also a focus on verifying the internal resistance value provided.

Discussion Status

The discussion is active, with participants providing feedback on each other's posts and seeking clarification on assumptions and values presented. There is an acknowledgment of the need for effort in responses, and some participants are reflecting on their understanding of the problem.

Contextual Notes

There is a mention of forum rules requiring participants to show effort in their posts, and a participant has indicated a lack of familiarity with these rules. The discussion also highlights the importance of specifying units when discussing values in physics.

boxman
Messages
2
Reaction score
0
Homework Statement
The internal resistance of a high voltage power supply is 24 MΩ and the output is set so that the potential difference across the output when on open circuit is 4000 V? When a load resistor RL is connected across the supply the voltage across RL is 3000 V.

What is the value of the load resistor?
Relevant Equations
I am not sure what equation to use.
But I think the answer is 32, is it correct?
 
Physics news on Phys.org
Hi @boxman and welcome to PF.
:welcome:
According to forum rules you must show at least an effort towards the answer. Perhaps you could explain what led you to think that the answer is 32 and not something else?
 
actually I rewatched the recording of the lecture and realized the answer was 72. But sorry about the low effort post its my first time using this forum and was unaware of the rules! :)
 
72? 72 what? Volts? Kilograms? Units do actually matter in the real world.
 
  • Like
Likes   Reactions: SammyS
boxman said:
Homework Statement:: The internal resistance of a high voltage power supply is 24 MΩ
Are you sure about the 24 MΩ number? That does not look right.
 

Similar threads

  • · Replies 2 ·
Replies
2
Views
1K
  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 3 ·
Replies
3
Views
932
  • · Replies 3 ·
Replies
3
Views
1K
Replies
2
Views
2K
Replies
2
Views
1K
  • · Replies 11 ·
Replies
11
Views
2K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K