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Voltage drop across a resistor in a circuit

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pcml100
#1
Mar18-11, 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
Attached Thumbnails
circuit.jpg  
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jhae2.718
#2
Mar18-11, 02:20 PM
PF Gold
jhae2.718's Avatar
P: 1,153
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.
pcml100
#3
Mar18-11, 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?

jhae2.718
#4
Mar18-11, 03:24 PM
PF Gold
jhae2.718's Avatar
P: 1,153
Voltage drop across a resistor in a circuit

That's it.
pcml100
#5
Mar18-11, 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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