78.
, ___________________ _________________________
________________________ ______________________
_____________________
| / | , , | I, | |
: :
78.
___________________ ________________________________
______ ____________
_____________________ __________________
______________ __________________
____________________________
____________________
_____________________ ()_______________
| / | , , | U, | I, | U =U/I | U= U1a | |||
:
:
:
80.
_____________ ___________________
____ __________ ___________ _________
____________________________________________
____ _____ ________
: __________ _______
| U1, /, - | U2, /,-- | 
| 
| U1- 
| d= 
| - | |
n -
d = 
: :
81.
___________________ _____________ _____________
________________________ , __________________________
________________________ __________________________
(, )
__________________________________________________________________
1. ú Zú/HZo
| / | U 
| j, | b, | U  = 
| 
| j=j-j0, | - | ||
| U=
UO.C=
U 0=
j0=
I=
|
2. 
| / | U
| U r | 
| b, | 
|
| |||
| U= I= |
: : :
|
|
|
82. y /(L2f)
(g= 900), (g= 0 1800) . g ³900. q .
83. ú hZú/ú hrú, ú aú/ú bú /(L2f
84.
_____________________ ______________ _________
________________ ______________ , __________
| / | b | b/ 0 | 
| |||
| 0= ___ |
: : :
85.
__________________ ___________________________________
__________________ , ____________________
2 l, __________ , ______________
__________ _______________________
____, ________ ______________________
__________, _______ ____________________
| t, c | I, A | U a, | Ub, | U, | d, % | U/I, / | |
:
:
:
86. - *
____________________ :
_________________
_________________
t, c_____
S, 2______
| UZ, | UX, | I,A | UZ/IS, /(×2) | UX/IS, /(×2) | , | |||
: : :
87. - *
____________________ :
_________________
_________________
_______________
____________________
, ______
| t, c | I,A | UZ, | UZ/IS, /(×2) | |
:
:
|
|
|
:
88.
______________________ ____________________________
______________________ , _____________
l, _____ I, __________
| t, c | U/I, / | Ut/(I l), (×)/(×) | t | s, / | |
S, ______
s2, /____
:
: :
