Current in a Network of Resistors

AI Thread Summary
The discussion revolves around solving a physics homework problem related to current in a network of resistors. Key equations mentioned include Ohm's Law (R = V/I) and formulas for equivalent resistance in series and parallel configurations. The user is prompted to share their calculations for further assistance, specifically asking about the voltage drop across an 8Ω resistor. The conversation emphasizes the importance of showing work to receive effective help. Overall, the focus is on applying electrical principles to analyze the circuit.
cbb12
Messages
1
Reaction score
0

Homework Statement


http://img97.imageshack.us/i/physicsquestion.png/

Homework Equations


R= V/I
For Series: Req= R1+R2
For Parallel: 1/Req= 1/R1+1/R2

The Attempt at a Solution


I have two attempts remaining for each question
 
Physics news on Phys.org
cbb12 said:

Homework Statement


http://img97.imageshack.us/i/physicsquestion.png/

Homework Equations


R= V/I
For Series: Req= R1+R2
For Parallel: 1/Req= 1/R1+1/R2


The Attempt at a Solution


I have two attempts remaining for each question


Show us your calculations so that we can help you.
 
What's the voltage drop across R2, the 8Ω resistor?
 
I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
Thread 'Collision of a bullet on a rod-string system: query'
In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
Thread 'A cylinder connected to a hanging mass'
Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
Back
Top