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Voltage drop across a resistor in a circuit 
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#1
Mar1811, 02:14 PM

P: 23

1. The problem statement, all variables and given/known data
Three batteries and four resistors are connected in a loop as shown (see attachment). What is the voltage drop across the top left resistor? 2. Relevant equations V = IR 3. The attempt at a solution This is part 3 of the 3 questions for this problem. On the other two I found the current of the loop and the voltage across points a and b. I think that all I need to do here is multiply IR (R being the value of that resistor) but that just seems too easy. Do I have to subtract it from the total voltage for the circuit or something? 1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution 


#2
Mar1811, 02:20 PM

PF Gold
P: 1,160

All you need to do is use loop laws to find the current, and then you can find the voltage drop over the resistor using Ohm's law.



#3
Mar1811, 03:22 PM

P: 23

Ok. I already found the current in the circuit and I assumed that I needed to use Ohm's Law to find the voltage drop, but my question is whether I just multiply the current in the loop by the value for the specific resistor and that's it, or if I have to do something after that step?



#5
Mar1811, 03:27 PM

P: 23

Awesome. Just seemed too easy so I thought maybe something else was going on. Thank you



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