How Much Charge Passes Through the Lamp in 1 Minute?

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Homework Help Overview

The discussion revolves around calculating the amount of charge passing through a lamp given two different current readings from ammeters. The original poster presents a calculation based on the sum of the currents and the time duration.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants question the validity of the total current calculation and the implications of differing ammeter readings. There is a focus on understanding how current splits in the circuit and the application of Kirchhoff's Current Law.

Discussion Status

The discussion is active, with participants exploring the implications of the current readings and questioning the assumptions made in the original calculation. Some guidance has been provided regarding the application of circuit laws, but no consensus has been reached on the correct interpretation of the current flow.

Contextual Notes

There are indications of confusion regarding the setup of the circuit and the placement of the ammeters, as well as the rules against providing direct answers in the forum.

Kofyebs
Messages
12
Reaction score
2

Homework Statement


Ammeter shows 1.2 A and 1.0 A. How large amount of charge passing through the lamp in 1 minute?
https://physicsforums-bernhardtmediall.netdna-ssl.com/data/attachments/84/84982-6e293679b3592fb475f0f9cac697526f.jpg

Homework Equations


Q=I*t[/B]

The Attempt at a Solution


I = 1.2 + 1.0 = 2.2
t = 1 * 60 = 60
Q = I*t

= 2.2 * 60 = 183 C[/B]
 

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Are you sure the current through the lamp is 2.2A?
 
cnh1995 said:
Are you sure the current through the lamp is 2.2A?
That's why I'm here for help.
 
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Likes   Reactions: Delta2
Kofyebs said:
That's why I'm here for help.
Why do you think the meters show different currents?
 
cnh1995 said:
Why do you think the meters show different currents?
Cuz they have different currents.
 
Kofyebs said:
Cuz they have different currents.
One meter shows 1.2A and other shows 1A. Where does the remaining current go?
 
cnh1995 said:
One meter shows 1.2A and other shows 1A. Where does the remaining current go?
I don't know. That's the question I got from my teacher. that's why I'm here for solutions.
 
Kofyebs said:
I don't know. That's the question I got from my teacher. that's why I'm here for solutions.
Well, providing direct answers is against the rules here. Helpers will only provide hints. Where do you think the current splits? Which meter will show 1.2A and which one will show 1A? Think on these and previous questions.
 
cnh1995 said:
Well, providing direct answers is against the rules here. Helpers will only provide hints. Where do you think the current splits? Which meter will show 1.2A and which one will show 1A? Think on these and previous questions.
I am here to find out if my equation is correct.
 
  • #10
I am sure you have been taught Kirchoff's Current Law and how to apply it in problems. What do you get if you apply this law at the middle point at the right side of the circuit?
 
  • #11
Kofyebs said:
I am here to find out if my equation is correct.
Q=I*t is always true.
Kofyebs said:
I = 1.2 + 1.0 = 2.2
t = 1 * 60 = 60
Q = I*t

= 2.2 * 60 = 183 C
This is not correct.
 
  • #12
cnh1995 said:
Q=I*t is always true.

This is not correct.
Thanks
 
  • #13
On my tablet computer i can only view one of the images in the original post but...Putting an ammeter in parallel with a lamp as shown in the second image isn't recommended.
 

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