Circuits with parallel resistors

AI Thread Summary
In a circuit with a 10V battery and three parallel resistors (R1=10ohm, R2=40ohm, R3=50ohm), the voltage across each resistor is 10V, as the voltage remains constant in parallel configurations. For a second scenario with resistors R1=10ohm, R2=20ohm, and R3=500ohm, where R2 carries a current of 100mA, the voltage across R2 is calculated to be 2.0V. Since the resistors are in parallel, R1 also experiences this voltage of 2.0V. The current through R1 is then calculated using Ohm's law, resulting in 200mA. The calculations and reasoning presented in the discussion are confirmed to be correct.
chiurox
Messages
35
Reaction score
0

Homework Statement


1) A circuit contains a 10V battery and three resistors in parallel. The resistors have values R1=10ohm, R2=40ohm, R3=50ohm. What is the voltage across each resistor?

2)This time, the 3 resistors in parallel have values R1=10ohm, R2=20ohm, R3=500ohm. The current flowing through R2=100mA. What is the current flowing through R1?


Homework Equations





The Attempt at a Solution


1) 10 V across each, because the voltage is the same across parallel resistors right?

2) I made a V-I-R chart. Since R2 has a current of 100mA and its resistance is 20ohm, then the voltage is 2.0V. Since the resistors are in parallel, the voltage is the same for R1.
So 2volts=I(10ohm)
I=200 mA is this correct?
 
Physics news on Phys.org
Hi chiurox,

That looks correct to me.
 
yeah that's absolutely right
 
Oh... ok, I was a bit insecure. thanks
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Similar threads

Calculating the voltage across capacitors and resistors with switches
Replies
2
Views
777
Finding the Current in a Resistor in a Closed Circuit
Replies
4
Views
2K
Why is it important to classify circuits as series or parallel?
Replies
5
Views
2K
I am having some difficulties solving a combination circuits problem
Replies
13
Views
1K
Equivalent resistance of a circuit
Replies
3
Views
2K
Operational Amplifiers & Resistors to form a Black Box
Replies
10
Views
2K
RC Circuit with parallel resistor
Replies
6
Views
3K
Parallel circuit with internal resistance
Replies
6
Views
2K
Determining Current Direction in a Charging RC Circuit
Replies
1
Views
2K
Voltage drop and current through each resistor
Replies
3
Views
2K

Hot Threads

Recent Insights

Back
Top