How is the voltmeter and ammeter connected in a circuit?

A voltmeter is connected in parallel with a device to measure its voltage, while an ammeter is connected in series with a device to measure its current.

 

 

SPM Physics Amali: Understanding Parallel Circuits

 

Light bulbs in parallel

💡 Light Bulbs in a Parallel Circuit (Litar Selari)

Litar selari terdiri daripada dua atau lebih cabang yang disambungkan merentasi bekalan kuasa yang sama. Setiap cabang menerima voltan bekalan yang penuh.

A parallel circuit consists of two or more branches connected across the same power supply. Each branch receives the full supply voltage.

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👀 Key Observations | Pemerhatian Penting

✅ Terdapat lebih daripada satu laluan untuk arus mengalir.

✅ There is more than one path for current to flow.

✅ Setiap mentol menerima voltan yang sama dengan sumber kuasa.

✅ Each bulb receives the same voltage as the power supply.

✅ Kedua-dua mentol menyala dengan lebih terang berbanding dalam litar siri.

✅ Both bulbs shine brighter compared to a series circuit.

✅ Jika satu mentol ditanggalkan, mentol yang lain masih menyala.

✅ If one bulb is removed, the other bulb remains lit.

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❌ Common Mistakes

❌ Menganggap arus adalah sama dalam setiap cabang.

❌ Assuming the current is the same in every branch.

❌ Mengelirukan litar selari dengan litar siri.

❌ Confusing a parallel circuit with a series circuit.

❌ Menyangka semua mentol akan padam apabila satu mentol rosak.

❌ Assuming all bulbs will go out when one bulb fails.

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⚠️ Safety / Handling

⚠️ Pastikan setiap cabang disambungkan dengan betul pada terminal bekalan kuasa.

⚠️ Ensure each branch is connected correctly to the power supply terminals.

⚠️ Elakkan sambungan wayar yang longgar kerana boleh menyebabkan bacaan tidak stabil.

⚠️ Avoid loose wire connections as they may cause unstable readings.

⚠️ Matikan bekalan kuasa sebelum mengubah susunan litar.

⚠️ Switch off the power supply before modifying the circuit.

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🎯 SPM Exam Tip

📌 Dalam litar selari:

📌 In a parallel circuit:

V₁ = V₂ = V₃

✅ Voltan adalah sama pada setiap cabang.

✅ Voltage is the same across every branch.

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📌 Arus daripada sumber dibahagikan kepada beberapa cabang.

📌 Current from the source is divided among the branches.

I = I₁ + I₂ + I₃

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📌 Jika satu mentol ditanggalkan, cabang lain masih lengkap.

📌 If one bulb is removed, the other branches remain complete.

📌 Sebab itu lampu rumah disambung secara selari.

📌 That is why household lighting circuits are connected in parallel.

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🔍 How to Identify a Parallel Circuit Quickly

✅ Mempunyai cabang atau simpang wayar.

✅ Has branches or junctions.

✅ Terdapat lebih daripada satu laluan arus.

✅ More than one path for current flow.

✅ Komponen boleh berfungsi secara bebas.

✅ Components can operate independently.

✅ Satu mentol rosak tidak menjejaskan mentol yang lain.

✅ One failed bulb does not affect the others.