• Support PF! Buy your school textbooks, materials and every day products Here!

Finding the value of this load resistor

  • Thread starter Bolter
  • Start date
  • #1
136
11

Homework Statement:

Calculate the resistance of load resistor

Relevant Equations:

V = IR
Question:

Screenshot 2020-02-14 at 09.05.33.png


I first knew that this would be a series circuit setup, there the current all around the circuit would be the same.

It's given that when it's a open circuit, p.d. across the output is 4000V hence the emf is therefore 4000V. When it gets connected to a load resistor, the voltage share is 3000V thus the voltage share on the internal resistance of the voltage supply must be 1000V

From this I can work out the current flowing through the circuit which gave me 4.1666... x10^-5 Amps

This should mean that 4.1666... x10^-5 amps is also passing through the load resistor, so the resistance of the load resistor is R = V/I or 72 Mega ohms

IMG-3860.JPG


Any help would be really appreciated. Thanks!
 

Answers and Replies

  • #2
BvU
Science Advisor
Homework Helper
2019 Award
12,887
2,965
No help possible, except to convince you you are doing OK...
 
  • #3
136
11
No help possible, except to convince you you are doing OK...
Ok thanks, I’m sure I am doing it right. It’s just that sometimes I make silly mistakes that I don’t tend to see at all but others can. But I checked again just to be sure
 

Related Threads for: Finding the value of this load resistor

Replies
8
Views
8K
Replies
2
Views
141
Replies
6
Views
192
Replies
3
Views
1K
Replies
16
Views
161
Replies
5
Views
646
  • Last Post
Replies
6
Views
11K
  • Last Post
Replies
4
Views
15K
Top