Page 279 - MODUL SPEKTRUM FIZIK SPM

(b) The kettle is then connected to a 240 V a. c. supply. Calculate
Cerek itu kemudian disambung kepada satu bekalan a. u. 240 V. Hitungkan

(i) The current that flows through the electric kettle.
Arus yang mengalir melalui cerek elektrik itu.

[2 marks / 2 markah]
(ii) The resistance of the heating elements in the kettle.
Rintangan elemen pemanas dalam cerek elektrik itu.

[2 marks / 2 markah]

(c) Four electric kettles W, X, Y and Z with specification 240 V, 2 kW are made from materials with
different characteristics.
Table 8.1 shows the characteristics of the materials.
Empat cerek elektrik W, X ,Y dan Z dengan spesifikasi 240 V, 2 kW diperbuat daripada bahan-
bahan yang mempunyai ciri yang berlainan.
Jadual 8.1 menunjukkan ciri-ciri bahan tersebut.

The characteristics of the materials are used in the heating element in the kettle
Kettle Ciri-ciri bahan yang digunakan dalam elemen pemanas cerek Fuse affixed
Fius yang
–8
Cerek Melting point / C Resistivity / (X 10 )  m
o
–8
Takat lebur / C Kerintangan / (X 10 )  m dipasangkan
W 350 13.5 10 A
X 85 5.2 10 A

Y 338 12.4 8 A

Z 106 4.63 8 A

Table 8.1 / Jadual 8.1

(i) Based on the melting point of the heating elements in Table 8.1, suggest two electric kettles
that are suitable for heating water. Give a reason for your answer.

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