Page 330 - MODUL SPEKTRUM FIZIK SPM

Uneven surface Reduce energy
Permukaan tidak rata Mengurangkan tenaga

High retaining wall Protect harbour from high waves
Tembok penahan yang tinggi Melindungi pelabuhan daripada gelombang tinggi
W is chosen / W dipilih

ELECTRICITY / KEELEKTRIKAN

1. (a) Current flowing through a conductor is directly proportional to the potential difference across it,
provided that its temperature and other physical conditions remain constant.
Arus yang mengalir melalui suatu konduktor adalah berkadar langsung dengan beza keupayaan
merentasinya, asalkan suhu dan keadaan fizikal yang lain kekal malar.
(b) (i) No / Tidak
(ii) Resistance is very high / Rintangan sangat tinggi
-3
(iii) From the graph, when V = 2.0 V, I = 4.6 x10 A
-3
Daripada graf, apabila V = 2.0 V, I = 4.6 x10 A
V
R =
I
2.0
= -3
4.6 x 10
= 434.8 Ω
(c) (i) X – K; Y – M; Z – L
(ii) Gradient of the graph represents the effective resistance of the circuit
Series circuit has higher resistance // Parallel circuit has lower resistance
Kecerunan graf mewakili rintangan berkesan dalam litar.
Litar bersiri mempunya rintangan tinggi // Litar selari mempunya rintangan
rendah.
(iii) R = Gradient of graph K / Kecerunan graf K
12
=
4
= 3 Ω

2. (a) When 240 V potential difference is supplied, 1.2 kJ of energy is produced per second.
Apabila 240 V beza keupayaan dibekalkan, 1.2 kJ tenaga dihasilkan setiap saat.
(b) (i) or = 5A

(ii) = 48 Ω

(c) (i) W and Y.
High boiling point / not easily boiled
High resistivity / produce more heat
W dan Y.
Takat didih tinggi / tidak mudah mendidih
Rintangan tinggi / menghasilkan lebih banyak haba

Sektor Pembelajaran, Jabatan Pendidikan Negeri Sabah | 2020 329