Percent Change Of current when the switch is closed

In summary, the conversation involves a discussion about finding the correct percentage for a given problem, with multiple attempts and incorrect answers. The conversation then shifts to a request for a circuit diagram and the explanation of a problem involving an ideal battery with an internal resistance and a glowing bulb with a specific resistance.
  • #1
ChrisWM
13
1
Homework Statement
By what percent does the current through A change when the switch is closed?

I found the value of the current to be .174 A when the switch is closed and value of the current when the switch is open to be .181 A.
Relevant Equations
final-initial/initial
(.174A-.181A)/.181A=-3.86% but it says it wrong, and I did (.181A-.174A)/.174A =4.02% but this was wrong too. I've tried 3.87%,3.86%,-3.87%,-3.67%,4.02%, and -4.02% but all were wrong. I'm really not sure what to do here.
 
Physics news on Phys.org
  • #2
Is there a circuit diagram?
 
  • Like
Likes ChrisWM
  • #3
1590556060734.png
Here you go!
 
  • #4
Here is the actual problem; For an ideal battery (r = 0 Ω), closing the switch in (Figure 1)does not affect the brightness of bulb A. In practice, bulb A dims just a little when the switch closes. To see why, assume that the 1.50 V battery has an internal resistance r = 0.30 Ω and that the resistance of a glowing bulb is R = 8.00 Ω.
 

Attachments

  • 1590556104997.png
    1590556104997.png
    3.5 KB · Views: 120
  • #5
cnh1995 said:
Is there a circuit diagram?
 

Attachments

  • 1590556762327.png
    1590556762327.png
    893 bytes · Views: 125

What is "Percent Change of current when the switch is closed"?

"Percent Change of current when the switch is closed" refers to the percentage difference between the current value of an electrical current and the new value that occurs when a switch is closed. It is a measure of the impact that closing a switch has on the current flow.

How is "Percent Change of current when the switch is closed" calculated?

The formula for calculating "Percent Change of current when the switch is closed" is: (New Current Value - Current Value) / Current Value x 100%. This will give you a percentage that represents the change in current flow after the switch is closed.

Why is "Percent Change of current when the switch is closed" important in scientific research?

"Percent Change of current when the switch is closed" is important in scientific research because it helps to measure and understand the impact that closing a switch has on electrical currents. This information can be used to make predictions, analyze data, and draw conclusions in various scientific experiments and studies.

What factors can affect the "Percent Change of current when the switch is closed"?

The "Percent Change of current when the switch is closed" can be affected by various factors such as the type of switch being used, the resistance in the circuit, the voltage source, and the material and length of the wire. These factors can impact the flow of current and therefore affect the percentage change when the switch is closed.

How can "Percent Change of current when the switch is closed" be measured in an experiment?

In order to measure "Percent Change of current when the switch is closed" in an experiment, you will need to collect data on the current flow before and after the switch is closed. This can be done using a multimeter or by recording the current values at specific time intervals. Then, using the formula mentioned in the second question, you can calculate the percentage change in current flow.

Similar threads

  • Introductory Physics Homework Help
Replies
2
Views
2K
  • Introductory Physics Homework Help
Replies
8
Views
3K
  • Introductory Physics Homework Help
Replies
7
Views
776
  • Introductory Physics Homework Help
Replies
6
Views
1K
  • Introductory Physics Homework Help
Replies
10
Views
8K
  • Introductory Physics Homework Help
Replies
10
Views
809
  • Introductory Physics Homework Help
Replies
13
Views
1K
Replies
6
Views
3K
  • Introductory Physics Homework Help
Replies
6
Views
1K
  • Engineering and Comp Sci Homework Help
Replies
13
Views
142
Back
Top