(adsbygoogle = window.adsbygoogle || []).push({}); R circuit (pretty simple) need checked - full working - please!!!

1. The problem statement, all variables and given/known data

see attachment

2. Relevant equations

P=IV

P_loss=I^2 R

V=IR

3. The attempt at a solution

ok

36=I^2*12

I_{_12Ω}=√3 A

V=20.8V

That is the same for the 3 resistors in parallel (I hope)

so I_{18Ω}=1.15A

I_{36Ω}=0.577A

the sum of these will give me the current through the unknown resistor

I_{unknown}=3.46A

net voltage = 60

60=V_{unknown}+ 20.8

V_{unknown}=39.2V

V=IR

R=11.3Ω

can someone please check this - wouldn't ask if I dint need it.

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# Homework Help: R circuit (pretty simple) need checked - full working - please

**Physics Forums | Science Articles, Homework Help, Discussion**