Saturday, November 27, 2010

SPM Trial MARA 2010 ~ paper 2 ( Resistance )


Diagram 6.1 and Diagram 6.2 show two electric circuits each consisting of a copper wire.
Rajah 6.1 dan Rajah 6.2 menunjukkan dua litar elektrik masing-masing mengandungi seutas wayar kuprum.

(a)
Name the quantity measured by the ammeter.
Namakan kuantiti yang diukur oleh ammeter.

Hits for answer the problem :
Key words " quantity"


(b)
(i) Compare the thickness of the copper wire in Diagram 6.1 and Diagram 6.2.
Bandingkan ketebalan wayar kuprum dalam Rajah 6.1 dan Rajah 6.2.
(ii)
Compare the ammeter reading in Diagram 6.1 and Diagram 6.2.
Bandingkan bacaan ammeter dalam Rajah 6.1 dan Rajah 6.2.

(iii) Relate the thickness of the copper wire to the ammeter reading.
Hubungkaitkan ketebalan wayar kuprum dengan bacaan ammeter .

(iv)
Relate the thickness of the copper wire to its resistance.
Hubungkaitkan ketebalan wayar kuprum dengan rintangan.


(c)
You are provided with three light bulbs labelled A, B and C labelled A, B and C as shown in
Diagram 6.3.
Anda dibekalkan dengan tiga mentol Anda dibekalkan dengan tiga mentol berlabel A, B dan C seperti dalam Rajah 6.3. seperti dalam Rajah 6.3.
Draw and label an electric circuit connecting all the three bulbs in which all the bulbs should light up with normal brightness connected to a power supply of 240 V alternating current . Add switches to the circuit.
Lukis dan label satu litar elektrik yang menyambungkan ketiga-tiga mentol di mana semua a mentol seharusnya menyala dengan kecerahan normal apabila disambungkan kepada bekalan kuasa 240 V arus ulang-alik. Tambahkan suis pada litar anda.



Suggested answers:

a) Electric current

b)
i) Thickenss of the copper wire of diagram 6.2 thicker than diagram 6.1.

ii) Ammeter reading in diagram 6.1 is less than diagram 6.2.


iii) The thicker the copper wire, the higher the ammeter reading.


iv) The thicker the copper wire, the lower the resistance.

c)



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