Page 86 - Softcopy for Teachers buku kerja + nota Nilam Publications

MODUL • Fizik TINGKATAN 5

Function: To disconnect the power supply when there is too large current flowing through
When the contact switch disconnected and the circuit is switched off, the current stop
Kekuatan elektromagnet bertambah sehingga mencukupi untuk menarik angker
(iii) Apabila sentuhan di sesentuh terpisah dan litar terputus, arus berhenti mengalir.
The strength of electromagnet increases until it is sufficient to pull the soft iron
Fungsi: Memutuskan bekalan kuasa apabila arus besar mengalir melalui litar.
Elektromagnet Electromagnet Wayar hidup

During the short circuit occurs, the current increases suddenly.
Semasa berlaku litar pintas, arus bertambah secara tiba-tiba.
N Live Wire

Angker besi lembut Soft iron armature Pangsi berspring, P Pivot with spring, P Spring, Q Butang reset Reset button

4 Pemutus litar / Circuit breaker a circuit. Cara kerja / Ways it works : (i) (ii) besi lembut. armature. flowing. Sesentuh Contacts S Ke litar rumah To household circuit UNIT 3

UNIT 3

3 Cuping telinga telefon / Telephone ear-piece

Cara kerja / Ways it works : Semasa bercakap melalui mikrofon, tenaga bunyi ditukar kepada tenaga elektrik. While talking through the microphone, the sound energy is converted into electrical energy. Arus elektrik yang berubah-ubah mengalir melalui gegelung dawai di cuping telinga. The varying current flowing through the coil wire at the earpiece. (iii) Teras besi lembut dimagnetkan dengan kekuatan yang berubah-ubah. The soft iron core is magnetised with varies strength. (iv) Diafragma ditarik oleh teras

(v)
(ii)
(i)

87 © Nilam Publication Sdn. Bhd.
03-Physic F5 2018.indd 87 26/08/2019 11:23 AM