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MODUL • Fizik TINGKATAN 5

Teknik Menjawab [Format Kertas 2 : Kefahaman / Esei Pendek]
Answering Technique [Paper 2 Format : Comprehension / Short Essay]

Dinamo basikal / Bicycle’s dynamo
Terangkan bagaimana dinamo menyalakan lampu basikal. • Magnet kekal diputarkan.
Explain how the dynamo lights up the bike’s bulb.
[4 markah / marks] The permanent magnet is rotated.
• Fluks magnet dipotong oleh gegelung dawai secara gerakan relatif.
Magnet kekal Pencengkam roda The magnetic flux is cut by the coil wire through the relative motion.
Permanent Wheel grip
magnet • Arus aruhan terhasil melalui aruhan elektromagnet.
Teras besi
Kotak dinamo Iron core The induced current produced through the electromagnetic induction.
Dynamo box Gegelung dawai
Wire coil • Tenaga kinetik → Tenaga elektrik → Tenaga cahaya

Punca bertebat Kinetic energy → Electric energy → Light energy
Insulated source

Teknik Menjawab [Format Kertas 2 : Bahagian B] UNIT 3
Answering Technique [Paper 2 Format : Part B]
UNIT 3
Cadang dan terangkan pengubahsuaian untuk menjadikan dinamo berfungsi secara lebih berkesan.
Suggest and explain modifications to make the dynamo work more efficiently.

Cadangan / Suggestion Sebab / Reason
Kekuatan magnet kekal: Menghasilkan arus yang lebih besar
Strength of permanent magnet:
Lebih kuat / Stronger [M1] Produce larger induced current [M2]

Bahan teras: Mudah dimagnet dan mudah dinyah-magnetkan
Material of core:
Besi lembut / Soft iron [M3] Easier to be magnetised and easier to be demagnetised [M4]
Bilangan lilitan gegelung dawai: Menambahkan kadar pemotongan fluks magnet
The number of turns of coil wire:
Lebih banyak / More [M5] To increase the cutting rate of magnetic flux [M6]
Luas keratan rentas / diameter dawai untuk membuat gegelung: Rintangan lebih kecil
Cross sectional area / diameter of wire of coil:
Lebih besar / Larger [M7] Smaller resistance [M8]
Bahan yang sesuai untuk gegelung dawai: Rintangan lebih kecil
Suitable material of coil wire:
Kuprum / Copper [M9] Smaller resistance [M10]

Saiz / diameter pencengkam roda: Menambahkan kadar pemotongan fluks magnet
Size / diameter of wheel gripper:
Lebih kecil / Smaller [M11] To increase the cutting rate of magnetic flux [M12]

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