Question

QUESTION 3 2 points Save for the circuit shown below, if 17 Ampers and R1-85 Ohms, and R2-31 Ohms, the current flowing in R2 equals to (in Ampers) R1} R2 }

Answer 1

For the current in R2 resistor :

Total resistance of circuit :

R=(R1*R2) /(R1+R2)

R=(85*31)/(85+31)

R=22.71ohm

Now, voltage through resistors :

V=I*R

V=7*22.71

V=158.97 volts

Now current through R2:

Ir2=V/R2

Ir2=158.97/31

Ir2=5.12 A

Another method:

Ir2=(R1/R1+R2) *I

Ir2=(85/85+31)*7

Ir2=0.732*7

Ir2=5.12A

You can calculate frome either of the above method.