Page 179 - MODUL SPEKTRUM FIZIK SPM

ELECTROMAGNETISM / KEELEKTROMAGNETAN

1. Diagram 1.1 shows a simple transformer. The bulb lights up at normal brightness.
The alternating current transmitted through the cable of resistance 2 Ω is 5 A.
Rajah 1.1 menunjukkan transformer yang ringkas. Mentol menyala pada kecerahan normal.
Arus ulang-alik yang mengalir melalui kabel yang berintangan 2 Ω adalah 5 A.

Diagram 1.1 / Rajah 1.1

(a) (i) What happen if the a.c. input is replaced by a 6 V direct current?
Apakah yang berlaku jika input a.u. digantikan dengan arus terus 6 V?

[1 mark / 1 markah]
(ii) Give a reason for answer 1(a)(i).
Berikan sebab untuk jawapan 1a(i).

[1 mark / 1 markah]
(b) Diagram 1.2 shows a model of simple transformer.
Rajah 1.2 menunjukkan satu model transformer yang ringkas.

Diagram 1.2 / Rajah 1.2

It is noted that the brightness of the bulb is low due to the power loss in transformer. Suggest
modifications that can be made to the transformer to increase the brightness of bulb based on the
following aspects.

Sektor Pembelajaran, Jabatan Pendidikan Negeri Sabah | 2020 178