SPM Physics Amali: Understanding Nichrome Wire (SWG 28)

 

🧵 Nichrome Wire (SWG 28)

Dawai nichrome ialah dawai rintangan yang diperbuat daripada aloi nikel dan kromium. Ia sering digunakan dalam eksperimen Fizik untuk mengkaji hubungan antara rintangan, panjang dawai, arus dan beza keupayaan.

Nichrome wire is a resistance wire made from an alloy of nickel and chromium. It is commonly used in Physics experiments to investigate the relationship between resistance, length, current and potential difference.

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👀 Cara Membaca | Reading Technique

✅ Ukur panjang dawai yang digunakan dengan pembaris atau metre rule dengan tepat.

✅ Measure the length of wire used accurately with a ruler or metre rule.

✅ Pastikan panjang dawai direkod dari titik sambungan ke kedudukan jockey atau klip.

✅ Ensure the wire length is measured from the terminal connection to the jockey or clip position.

✅ Ambil bacaan ammeter dan voltmeter hanya selepas bacaan menjadi stabil.

✅ Record ammeter and voltmeter readings only after they have stabilised.

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❌ Common Mistakes

❌ Mengukur panjang dawai dari titik yang salah.

❌ Measuring the wire length from the wrong reference point.

❌ Dawai tidak ditegangkan menyebabkan panjang sebenar berubah.

❌ The wire is not properly stretched, causing inaccurate length measurements.

❌ Menggunakan dawai yang telah menjadi panas semasa mengambil bacaan.

❌ Taking readings when the wire has already become hot.

❌ Mengelirukan nichrome wire dengan connecting wire biasa.

❌ Confusing nichrome wire with an ordinary connecting wire.

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⚠️ Safety / Handling

⚠️ Matikan bekalan kuasa apabila tidak mengambil bacaan.

⚠️ Switch off the power supply when readings are not being taken.

⚠️ Nichrome wire boleh menjadi panas selepas arus mengalir untuk tempoh yang lama.

⚠️ Nichrome wire may become hot after prolonged current flow.

⚠️ Elakkan menyentuh bahagian dawai yang panas dengan tangan.

⚠️ Avoid touching the heated section of the wire.

⚠️ Jangan menarik dawai terlalu kuat kerana ia mudah berubah bentuk.

⚠️ Do not stretch the wire excessively as it may deform.

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🎯 SPM Exam Tip

📌 Semakin panjang dawai nichrome, semakin besar rintangannya.

📌 The longer the nichrome wire, the greater its resistance.

📌 Apabila panjang dawai bertambah, bacaan ammeter biasanya berkurang.

📌 As the wire length increases, the ammeter reading usually decreases.

📌 Nichrome wire sering digunakan dalam eksperimen menentukan hubungan antara R ∝ l (resistance is proportional to length).

📌 Nichrome wire is commonly used in experiments investigating R ∝ l (resistance is proportional to length).

📌 Dalam SPM, jangan lupa nyatakan bahawa nichrome wire ialah resistance wire.

📌 In SPM answers, do not forget to state that nichrome wire is a resistance wire.