it's about voltage division.it's the part of EEE.

1. Presented by
Atik Ikbal Ovi

2. Fig-a
Fig-b
Source-Google

3. Vs=iR1 + iR2----1
i=
V1=iR1=Vs
V2=iR2=Vs
Vs=iReq
Req=R1+R2
Req=R1+R2+…n =
Vn= Vs
21
1
RR
R

21
2
RR
R

Source:-
Electric_Circuits_Nilsstion_R
eidel
21 RR
Vs


N
n
Rn
1
RnRR
Rn
 ...21

4. Fig-Potentiometer
Source-Google

5. The current-divider circuit
v=i1R1=i2R2= is
I1= s
I2= s
21
21
RR
RR

iRR
R
21
2

iRR
R
21
1


6. Source:-
Electric_Circuits_Nilsstion_Reidel
&
Google
Fig-Circuit used to illustrate
voltage division
Fig-Circuit used to
illustrate current
division