, , , .
i R
RBH
UXX i R
.
1. (U).
2. .
3. .
R1 a R2
E1 R3 i3 E2
i R1 a R2
E1 UXX E2
. ( ).
, , . . , , .
RBH
UXX R
E1 RBH R
R1 R2
a
RBH
:
1. , .
2. .
3. -:
.
i(t)=I(t+T)
T -.
f=1/T []=1/c
i(t)=Im*sin(wt+j)
Im
w
w=2pf=2p/T [/]
j -
wt
.
f(t)=f(t+T)
, R , .
.
i(t) R
U(t)
U(t)=Umcos(wt+jm)
i(t)=U(t)/R=(Um/R)*cos (wt+ju)
i(t)=Im*cos(wt+jI); Im=Um/R;
jI=ju; y=ju-jI=0
Im
Um
ju jI
PR(t)=U(t)*I(t)=Um*Im*cos2(wt+jU=
Um*Im*(1+cos2(wt+jU))/2=
UI(1+cos2(wt+jU));
PÎ[0;2U]
R .
13. .
L
i(t)
U(t)
i(t)=Im*cos (wt+jI)
eL= - Ldi(t)/dt=-Limw(-sin(wt+jI))
eL(t)= - UL(t)
UL(t)= - Limwsin(wt+jI)=ImwL*
*cos(wt+jI+p/2)
UL(t)=Um* cos(wt+ju),
ju=jI+p/2
Xl=wL
Um=ImXL
Um Im
ju=jI+p/2
p/2
jI
PL(t)=U(t)*i(t)= - ImUmcos(wt+jI)*
|
|
sin(wt+jI)= - (ImUm*sin2(wt+jI))/2
PL(t)= IU*sin2(wt+jI)