[r]
(1)PHoNG GD&DT viNn y0N
of cnilvn rHrlc
Hl/ouc oAN CHAM
nt xrnwr rRA Hec r* r nAu Hec 2ot7-2018 prON: vAt li - Lop
r phAn tric nghi€m (3 tri6m) *a,
"Il,u),i'T,T;#'i!!;;,f
thdi gian giao di)
II Phin tg lugn 1Z aiOmy
Cdu J 4 5 6
Drip 6n C D B A C C
Ciu NOi dung
a) Quy thc nlmtay ph6i:
NEm bdn tay phii, rOi dpt sao cho b6n ngon ray
hudng theo chi6u ddng di6n chay qua c6c vdng d6y thi
ng6n tay cdi chodi chi chidu cira duong su'c tu trong long
_6ng- d_ay:
b) Hinh t: Ddu;;;fii.,-uir n il;";;-
-Hinh 2: DduD ld cpc BEc, dAu C ld clrc Nam
Di6m
7
(2 di6m)
1,0
0,5 0,5
(2 di6m)
a) Cuong dQ ddng diQn chay
t =!- lloo =5(A\
u 220
0,5 b) Dren ndng ti€u thu khi sir dUng qupt trong I th6ng:
A:9.t: 1100.30.0,5: 16500 (wh) :16,5 kwh Ti6n di6n ph6i tri trong 1 th6ng:
16,5.2000 : 33 000 (d6ng) 0,5
0,5
c) Thoi gian dun 6m nu6c khl[i6; aiil-the ;s;d; die;
hq xudng cdn 200V:
u: 2202
t, =
fr.r, = ffi.to =36,3 (phirt) : 36phLit I giay
0,5
9 (3 tli6m)
a) Di6n trd tucrng duong cira mpch:
Ran: Rr * R.z: B + 4: 12 (O)
Cudng d6 ddng di6n qua mdi di6n tro:
r=+ =y=Z(A)
, Rn, 12
b) C6ng sudt ti6u thp ctia dogn mach AB:
I : I2.Ra s:22 12:48 (W)
Rr R,
c) r]-*
I -r I
0,5
0,5
(2)Ei6n trcy ctra ddn:
nu "0,6-=*-=g=24(o)
DiQn trO tucrng duong cfra do4n m4ch AC:
Ro = *,'*o = r''! .= 6(e)
R, +Ro 8+24 \ /
DiQn trd tucrng ducrng cta do4n mpch AB: Rae: Rac * R.z : 6 * 4:10 (fl)
Culng dQ dong diQn qua mqch chinh:
r ' Ro, = Jf =+:2,4(A)
10
Hi6u diQn thd dAu ddn:
U, = I".Ro" =2,4.6-I4,4(V) > Uo
Vpy ddn s6ng hcrn binh thucyng, c6 th6 ch6y
0,25
0,25
0,25
0,25
0,25