In the circuit shown, a voltage drop of 6.6 V wil occur across which of the following resistors? A. R_1 B. R_2 C. R_3 D. R_4

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In the circuit shown, a voltage drop of 6.6 V wil occur across which of the following resistors? A. R_1 B. R_2 C. R_3 D. R_4

Physics
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|dw:1433877050526:dw|
here we have to compute the total or equivalent resistance
the equivalent resistance is given by the subsequent formula: \[\Large {R_{EQ}} = 8.5 + 3.2 + \frac{1}{{\frac{1}{{13}} + \frac{1}{{18}}}} = ...\Omega \]

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Other answers:

so we get 19.248?
ok! we can assume R_eq=19.25 ohms
so the total current is: I=15/19.24=...amperes
and we get 0.779?
ok! I=0.779 amperes. Now the voltage drop of resistor R_1 is: V_1=8.5*0.779=...volts
6.6215!
ok! maybe it is the right answer the voltage drop of resistor #4, is: V_4=3.2*0.779=...volts
2.4928!
ok!
now the voltage drop V_AB is: 15-(6.6215+2.4928)=...volts |dw:1433877631686:dw|
5.8857!
ok! so what is the right option?
R_4 ?
why?
becuase it it closest to 5.8? i am a bit confused:/
we are searching for a 6.6 voltage drop
ohhh ok! so it should be R_3?
no, since V_AB=5.8857
what is the voltage drop of R_1?
ohh i am confused:(
oh! it is 6.62! ohhhh so it would be R_1 ? :O
yes! that's right!! :)
ohh okie! yay!! Thank you!!:D
:):)

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