RCL-stroombane
d) cos θ = R = 20 = 0,67 voorlopend Z
30,05 Z
e) • Verander die kapasitor, • Spoel, of • Verander toevoerfrekwensie
f) • XL = XC
• R = Z • Z is min • I is maks • Cos θ = 1 • θ = 0° • VL • VR
= VC = VT
g) VT = I × Z = (5 mA)(20) = 100 mV (teen fr R = Z = 20 Ω)
Vraag 3 Verwys na die stroombaandiagram hieronder en bereken die: a) totale stroom in die baan.
b) weerstand van die 60 watt 110 volt-lamp. c) impedansie van die stroombaan.
d) Bereken die induktansie van die spoel wat in serie met die 60 watt 110 volt- gloeilamp verbind moet word sodat dit met ’n 220 volt 50 Hz WS kan werk (veronderstel die weerstand van die spoel is onbeduidend).
5
(3) (3) (3)
(6)
[15]
Antwoorde vir vraag 3: 110
a) I = P = 60 = 0,55 A (545,45 mA) V
b) RLAMP = VLAMP = 110 = 201,67 Ω ILAMP
0,55
c) Z = ___ = 220 = 403,34 Ω I
VT d) XL = √ Z2 L =
____ 0,55
– R2 = √ 403,342 – 201,672
2 πf = 349,3 = 1,11 H 2 π(50) XL
= 349,3 Ω
117
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