For the circuit in Figure 38 if R 1k ohm calculate I Use cu

For the circuit in Figure 3.8, if R = 1k ohm, calculate I. Use current division to calculate I_r. Enter your results in Table 3.6. Repeat for R = 2.7k and 3.3k ohms.

Solution

(a) R=2700 ohms

Req=(2700*1000)/(2700+1000)+100*10^3=100729.729 ohms

current I=15/100729.729=1.48*10^-4 amps.

by using current divission.

IR=(1.48*10^-4*1000)/(1000+2700)=4*10^-5 amps.

(b) R=3300 ohms.

Req=(3300*1000)/(3300+1000)+100*10^3=100767.44 ohms.

current I=15/100767.44=1.4885*10^-4 amps.

by using current divission

IR=(1.4885*10^-4*1000)/(1000+3300)=3.4616*10^-5 ampss.

(c) R=1000 ohms.

Req=(1000*1000)/(1000+1000)+100*10^3=100500 ohms.

current I=15/100500=1.49*10^-4 amps.

by using current division

IR=(1.49*10^-4*1000)/(1000+1000)=7.49*10^-5 amps.