Question about Ohm's law.

  • Thread starter doublea500
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  • #1
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just a quick question about ohms law (v=ir) concerning when there is a parallel and a series in the same circuit. i know the rules like in a parallel, v total is v1+v2... and in a series it is 1/v+1/v2=1/vt. and thats the opposite for Current. but what do i do when there is a series and a parallel in the same question.

heres a basic question i just made. sorry its a bit dirty.

i just changed the question to help understand the concept better

The problem i have is that i can find Rt but i have no idea what to do with it because... there are 2 different things
 

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  • #2
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Looks like homework to me.

Looking at the questions

What do you mean calculate current from R1 etc and voltage from R1 etc?

You calculate current through a resistor and the voltage across a resistor.

If you have to calculate these for each resistor the effective resistance Rt will not help you.
 
  • #3
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Looks like homework to me.

Looking at the questions

What do you mean calculate current from R1 etc and voltage from R1 etc?

You calculate current through a resistor and the voltage across a resistor.

If you have to calculate these for each resistor the effective resistance Rt will not help you.
so just replace from with through then :D. and how do i find the voltage and current Through these resistors without effective resistance?
 
  • #4
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actually, could i just find the Rt then find the Current in total. and then like separate it using proportions? like say the Rtparallel was 2 and the Rtseries was 2. and Rt in all was 4. Lets say V=8. im just making this up now, so you dont get confused with the pic on top. so i could do V=IR->8=I*4. Itotal=2. i is the same in a series so each resistor in the series is I=2A and for the Parallel i can do the It=I1+I2.... i think i got it.
 
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  • #5
Redbelly98
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That's pretty much right. You would still have to figure out what I1 and I2 are.
 

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