4 Diagram 4.1 shows a transistor circuit.
Rajah 4.1
menunjukkan satu litar transistor.
Diagram
4.1
Rajah 4.1
(a) What is the function of the circuit?
Apakah fungsi bagi litar
itu?
.....................................................................................................................................
[1 mark]
[1 markah]
(b) (i) What will happen to the resistance of LDR
when the surrounding is dark?
Apakah yang akan
berlaku kepada rintangan PPC apabila keadaan sekeliling menjadi gelap?
..............................................................................................................................
[1 mark]
[1 markah]
(ii) Based
on your answer in 4 (b)(i),
explain how bulb L is lighted up?
Berdasarkan jawapan anda dalam 4 (b)(i), terangkan bagaimana lampu L menyala?
..............................................................................................................................
..............................................................................................................................
[2 marks]
[2 markah]
(c) The
transistor is switched on when Vp reaches 2.0 V. The resistance of the LDR at
this voltage is 10 kΩ.
Transistor dihidupkan apabila
Vp
mencapai 2.0 V. Rintangan PPC pada
ketika ini adalah 10 kΩ.
Calculate
the maximum resistance of resistor S.
Kirakan rintangan
maksimum perintang S?
[2
marks]
[2 markah]
(d) Why bulb L is connected at the secondary circuit?
Mengapa lampu L
disambung pada litar sekunder?
.....................................................................................................................................
[1
mark]
[1 markah]
JAWAPAN:
Question
|
Answer
|
Mark
|
4.a
|
As an automatic switch // Sebagai
litar suis automatik
|
1
|
4.b.i
|
Increase // Bertambah
|
1
|
4.b.ii
|
M1 The
base voltage Vp increase // base current also increase
Beza keupayaan tapak meningkat // arus
tapak turut meningkat
M2 The transistor is switched on // the
collector current flow // relay is switched on
Transistor berfungsi // arus pengumpul mengalir // suis geganti
dihidupkan
|
1
1
|
4.c
|
4 = Rs
x 6
Rs + 10
Rs
= 20 kΩ
|
1
1
|
4.d
|
Bulb L
required high voltage to light up
Mentol L memerlukan beza keupayaan yang tinggi untuk
menyala
|
1
|
Total
|
7
|
1 comment:
soalan c tu nilai Rs berapa?
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