Chapter 13 Transducers

Example 13.1 Page no 412

In [4]:
#Given
R=5*10**3                                 #ohm
a=0.9                                     #in.
b=3.0                                      #in.
R2=1500                                    #ohm
Vt=5                                       #volts

#Calculation
R2=(a*R)/b
V0=(R2/R)*Vt

#Result
print"The value of output resistance is ", V0,"volts"

The value of output resistance is  1.5 volts

Example 13.2 Page no 413

In [9]:
#Given
a=3
b=5.0           
R=5*10**3                                     #ohm
Vt=5                                           #volts
R4=2.5*10**3                                   #ohm

#Calculation
R2=(a*R)/b
Ve=((R2/R)*Vt-(R4/R)*Vt)

#Results
print"The value of Ve is ",Ve,"volts"

The value of Ve is  0.5 volts

Example 13.3 Page no 417

In [14]:
#Given
K=2
R=130                               #ohm
l=1*10**-6

#Calculation
R1=K*R*l

#Result
print"The value of change in resistance is ", R1*10**6,"micro ohm"

The value of change in resistance is  260.0 micro ohm

Example 13.4 Page no 427

In [29]:
#Given
Vt=15                                 #Volts
R1=4000.0                              #ohm
R2=17.0                                 #ohm
R3=3.0                                   #ohm
R4=950                                   #ohm

#Calculation
I=Vt/(R1+R2+R3)
I1=Vt/(R2+R3+R4)

#Result
print" Meter reading at 77 degree F is ", round(I*10**3,2),"mA","\n Meter reading at 150 degree F is ",round(I1*10**3,1),"mA"

 Meter reading at 77 degree F is  3.73 mA 
 Meter reading at 150 degree F is  15.5 mA

Example 13.5 Page no 432

In [8]:
#Given
L=2500                          #F
a=1
b=0.04

#Calculation
c=a-b
Lt=L*(1/c)
Ld=Lt-L

#Result
print"The value of inductance is ", round(Ld,0),"micro H"

The value of inductance is  104.0 micro H

Example 13.6 Page no 437

In [43]:
#Given
V1=6.3                                     #volts
V2=5.2                                     #Volts
a=-0.5                                       #in.
b=-0.30
c=-5.2
d=-0.25

#Calculation
V0=(b*c)/a
V=(d*c)/a

#Result
print"(i)  The output voltage is ", V0,"Volts"
print"(ii) The output voltage is ", V,"volts"

(i)  The output voltage is  -3.12 Volts
(ii) The output voltage is  -2.6 volts

Example 13.7 Page no 450

In [49]:
#Given
K=0.32
a=7.06*10**-3                                   #J

#Calculation
E=a/K

#Result
print"Electric energy is ", round(E*10**3,2),"mJ"

Electric energy is  22.06 mJ

Example 13.8 (a) Page no 453

In [62]:
#Given
V=30                                    #Volts
I=10*10**-3                             #A
Rcell=1000                                   #ohm
R1=100*10**3                                 #ohm

#Calculation
R=(V/I)-Rcell
I1=V/(R+R1)

#Result 
print"(i) The required series resistance is ", R*10**-3,"Kohm"
print"(ii) Dark current level is ",round(I1*10**3,1),"mA"

(i) The required series resistance is  2.0 Kohm
(ii) Dark current level is  0.3 mA

Example 13.8 (b) Page no 460

In [13]:
#Given
R0=180
a=0.00392
T1=60                         #degree
T2=20                         #degree

#Calculation
R=R0*(1-(a*(T1-T2)))

#Result
print"The resistance is ", round(R,2),"ohm"

The resistance is  151.78 ohm

Example 13.9 Page no 460

In [14]:
#Given
R0=100.0
a=0.00392
T1=50                          #degree
T2=25                         #degree
R=200                          #ohm

R=R0*(1+a*(T1-T2))
t2=(((R/R0)-1)/a)+T2
print t2

50.0