How to Calculate the Internal Resistance of a Battery?

AI Thread Summary
To calculate the internal resistance of a battery, the problem involves a torch bulb rated at 2.5V and 0.3A connected to a 3.0V dry battery, producing a potential difference of 2.5V across the bulb. The internal resistance can be derived using the formula for voltage, current, and resistance, but the user is seeking guidance on the step-by-step calculation process. Participants in the discussion emphasize the importance of showing attempted solutions to receive assistance. The user expresses confusion due to the absence of their tutor. Clarification on the calculation method is requested to understand how to arrive at the answer of 1.67.
SJN
Messages
2
Reaction score
0

Homework Statement


A torch bulb is marked 2.5V and 0.3A. When it is connected to a dry battery of e.m.f 3.0V the correct p.d of 2.5V is produced across it. Calculate the internal resistance if the battery.

Homework Equations


I=V/R?

The Attempt at a Solution


It's on paper - sorry!Answer = 1.67 - But how you get to that is the question - working out must be shown.

Thanks in advance,
Sam
 
Last edited:
Physics news on Phys.org
SJN said:
Answer = 1.67 - But how you get to that is the question - working out must be shown.
We do not provide solutions here. We will help you will your homework, but you have to show some effort first, by typing out your attempted solution for example.

The same goes for your other thread, "I don't know how to start" isn't an attempted solution.
 
OK Sorry,

It's just I tried to find my tutor today, and couldn't see him, so I'm a little puzzled.

Not to worry, have a good day.
 
Thread 'Help with Time-Independent Perturbation Theory "Good" States Proof'

Thread 'Help with Time-Independent Perturbation Theory "Good" States Proof'

(Disclaimer: this is not a HW question. I am self-studying, and this felt like the type of question I've seen in this forum. If there is somewhere better for me to share this doubt, please let me know and I'll transfer it right away.) I am currently reviewing Chapter 7 of Introduction to QM by Griffiths. I have been stuck for an hour or so trying to understand the last paragraph of this proof (pls check the attached file). It claims that we can express Ψ_{γ}(0) as a linear combination of...
View full post »

Similar threads

Insights How to Measure Internal Resistance of a Battery
Replies
12
Views
5K
B Troubleshooting Battery Internal Resistance Measurements
3
Replies
105
Views
10K
How to solve for EMF and internal resistance in a circuit?
Replies
8
Views
3K
Equation for the Internal Resistance of a Battery
Replies
5
Views
3K
How Does Internal Resistance Affect Terminal Voltage in a Circuit?
Replies
1
Views
3K
Unraveling the Mystery of EMF Internal Resistance
Replies
2
Views
2K
Batteries in series, parallel, and internal resistance
Replies
24
Views
5K
Potentiometer and EMFs with internal resistance
Replies
4
Views
3K
How to Calculate EMF and Internal Resistance in a Circuit?
Replies
1
Views
4K
Finding the internal resistance of battery
Replies
10
Views
3K

Hot Threads

Recent Insights

Back
Top