Question

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

Answer 1

here we have to compute the total or equivalent resistance

Answer 2

the equivalent resistance is given by the subsequent formula:
\[\Large {R_{EQ}} = 8.5 + 3.2 + \frac{1}{{\frac{1}{{13}} + \frac{1}{{18}}}} = ...\Omega \]

Answer 3

so we get 19.248?

Answer 4

ok! we can assume R_eq=19.25 ohms

Answer 5

so the total current is:
I=15/19.24=...amperes

Answer 6

and we get 0.779?

Answer 7

ok! I=0.779 amperes.
Now the voltage drop of resistor R_1 is:
V_1=8.5*0.779=...volts

Answer 8

6.6215!

Answer 9

ok! maybe it is the right answer
the voltage drop of resistor #4, is:
V_4=3.2*0.779=...volts

Answer 10

2.4928!

Answer 11

ok!

Answer 12

now the voltage drop V_AB is:
15-(6.6215+2.4928)=...volts