Load Voltage Problem - Find the Fault!

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The discussion revolves around a load voltage problem where the correct answer is identified as -3. Participants highlight the importance of considering both I1 and I2 currents when calculating the final voltage across the resistor. There is an emphasis on maintaining consistent units throughout the calculations. Acknowledgment of an error in the initial approach is noted, leading to clarification on the method needed to find the fault. The conversation underscores the necessity of thorough analysis in electrical problems.
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Homework Statement



Problem is in the pic. uploaded.


Homework Equations





The Attempt at a Solution



Also in the pic. The right answer is -3, where is the fault? Thank you!
 

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It is hard to read your approach.
You just consider I2 to calculate the final voltage, but there is also I1 flowing through the resistor. And you should use units in a consistent way.
 
You are right. My mistake!
 
Last edited:

Thread 'Errors and significant figures'

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...
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Thread 'A cylinder connected to a hanging mass'

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...
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