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MODUL • Fizik TINGKATAN 5

Latihan / Exercise

1 Rajah menunjukkan litar transistor. Perintang P 2 Rajah menunujukkan simbol transistor n-p-n.
mempunyai rintangan 10 kΩ. Untuk menyalakan mentol, The diagram shows the symbol of an n-p-n transistor.
beza keupayaan merentasi perintang P mestilah sekurang-
kurangnya 2 V. 120 mA
The diagram shows a transistor circuit. Resistor P has a C
resistance of 10 kΩ. In order to light up the bulb, the potential 5 mA
difference across resistor P must be at least 2 V. B
E
x
S I e
Y T 12 V Apakah nilai I ?
e
What is the value of I ?
P Penyelesaian e
Solution
Z
Apakah nilai tertinggi perintang S apabila mentol menyala? I = I + I c
B
E
What is the maximum value of resistor S when the bulb = 5 mA + 120 mA
lights up? = 125 mA
Penyelesaian
Solution

V p = R p
V XZ R p + R s
2 V 10 k Ω
=
12 V 10 k Ω + R s
10 k Ω + R = 60 k Ω
s
R = 50 k Ω
s
UNIT 4

3 M
UNIT 4
X
KBAT
S
Q
R
6 V Y
P Suis
geganti
V Relay
p
switch 240 V a.u.
Z 240 V a.c.
(a) (i) Namakan komponen P.
Name component P.
(ii) Apakah fungsi bagi komponen P?
What is the function of component P?
(b) Apakah fungsi perintang R?
What is the function of resistor R?
(c) (i) Apakah yang akan berlaku kepada beza keupayaan V pada waktu malam?
p
What happens to potential difference V at night?
p
(ii) Terangkan kenapa mentol menyala pada waktu malam.
Explain why the bulb is lighted up at night.
(d) Mentol M berlabel 240 V, 60 W mula menyala apabila V mempunyai nilai minimum 2.0 V dan rintangan bagi perintang
p
P adalah 10 kΩ. Tentukan rintangan perintang S.
Bulb M, labelled 240 V, 60 W starts to light up when V has a minimum value of 2.0 V and the resistance of resistor P is 10 kΩ.
p
Determine the maximum resistance of resistor S.

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