# Sumber Arus Listrik

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REMEDIAL "SUMBER ARUS LISTRIK" T.P. 2009/2010SMP NEGERI 9 DEPOKJl. Raya Cipayung No. 27 Pancoranmas Depok Telp. (021) 779 1103email : [email protected] : smpn9depok.wordpress.comGuru : JOHAN, S.Pd

• 1.

### Perhatikan pernyataan berikut mengenai sumber arus listrik berdasarkan arahnya! 1)       Memiliki bentuk tegangan   2)       Memiliki bentuk tegangan  3)       Memiliki lambang : 4)       Memiliki lambang 5)       Contoh : listrik PLN, generator AC, dinamo sepeda 6)       Contoh : elemen volta, baterai, aki Yang merupakan sumber tegangan bolak-balik ditunjukkan oleh pernyataan ... .

• A.

1), 3), 5)

• B.

1), 3), 6)

• C.

2), 3), 5)

• D.

2), 4), 6)

C. 2), 3), 5)
Explanation
The correct answer is 2), 3), 5). This is because statement 2) mentions "Memiliki bentuk tegangan" which translates to "Has the form of voltage" and statement 3) mentions "Memiliki lambang :" which translates to "Has the symbol :" and statement 5) gives examples of sources of alternating current (AC) such as PLN electricity, AC generator, and bicycle dynamo. These statements indicate that the source mentioned has an alternating voltage, which is represented by a symbol, and is exemplified by AC sources.

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• 2.

### Di bawah ini merupakan larutan elektrolit yang digunakan beberapa elemen.1) HCl2) KOH3) NH4Cl4) H2SO4Elemen Volta menggunakan larutan elektrolit ... .

• A.

1)

• B.

2)

• C.

3)

• D.

4)

D. 4)
Explanation
The correct answer is 4) H2SO4. Elemen Volta menggunakan larutan elektrolit H2SO4.

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• 3.

### Di bawah ini merupakan elektroda yang digunakan beberapa elemen.1) Cu (tembaga)2) Zn (seng)3) C (karbon)4) PbO2 (timbal dioksida)5) Pb (timbal)Elemen Volta menggunakan elektroda ... .

• A.

5) dan 2)

• B.

4) dan 5)

• C.

3) dan 2)

• D.

1) dan 2)

D. 1) dan 2)
Explanation
The correct answer is 1) dan 2). This is because in a Voltaic cell, two different metals are used as electrodes, with one metal being the anode and the other being the cathode. In this case, Cu (tembaga) and Zn (seng) are both metals and can be used as electrodes in a Voltaic cell.

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• 4.

### Di bawah ini merupakan larutan elektrolit yang digunakan beberapa elemen.1) PbSO42) KOH3) NH4Cl4) H2SO4Elemen kering (baterai) menggunakan larutan elektrolit ... .

• A.

1)

• B.

2)

• C.

3)

• D.

4)

C. 3)
Explanation
The correct answer is 3) NH4Cl. The explanation for this is that NH4Cl is an electrolyte because it dissociates into NH4+ and Cl- ions when dissolved in water. In a dry cell battery, the electrolyte is typically a paste or gel that contains NH4Cl, which allows for the flow of ions and the generation of electricity. Therefore, NH4Cl is the most suitable electrolyte for use in a dry cell battery.

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• 5.

• A.

Energi kimia --> energi cahaya --> energi listrik

• B.

Energi listrik --> energi kimia --> energi cahaya

• C.

Energi kimia --> energi listrik --> energi cahaya

• D.

Energi listrik --> energi cahaya --> energi kimia

C. Energi kimia --> energi listrik --> energi cahaya
Explanation
When a battery is used to power a flashlight, the energy transformation that occurs is from chemical energy stored in the battery to electrical energy, which is then converted to light energy. This is because the chemical reactions happening inside the battery produce an electric current, which flows through the circuit of the flashlight and powers the light bulb, converting the electrical energy into light energy.

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• 6.

### Perhatikan gambar berikut!Jika S3 dan S5 terbuka, maka lampu yang menyala ... .

• A.

L1, L3, dan L5

• B.

L1, L2, dan L4

• C.

L3 dan L5

• D.

L2 dan L4

B. L1, L2, dan L4
Explanation
Jika S3 dan S5 terbuka, maka lampu yang menyala adalah L1, L2, dan L4.

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• 7.

### Perhatikan gambar berikut ini!1) 2)3)4)Pengukuran ggl pada rangkaian listrik di atas ditunjukkan oleh gambar ... .

• A.

1)

• B.

2)

• C.

3)

• D.

4)

D. 4)
Explanation
The correct answer is 4) because the image shows a voltmeter connected in parallel to the circuit, which is used to measure the voltage across the circuit.

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• 8.

### Elemen volta tidak dapat mengalirkan arus listrik dalam waktu yang lama karena ... .

• A.

Timbul gelembung gas hidrogen yang menempel pada seng

• B.

Timbul gelembung gas hidrogen yang menempel pada katoda

• C.

Timbul gelembung gas hidrogen yang menempel pada anoda

• D.

Keping-keping seng dan tembaga yang terendam mudah rusak

C. Timbul gelembung gas hidrogen yang menempel pada anoda
Explanation
The correct answer is "timbul gelembung gas hidrogen yang menempel pada anoda." When a voltaic cell is in operation, the anode undergoes oxidation, releasing electrons and producing hydrogen ions. These hydrogen ions then react with the electrons at the cathode to form hydrogen gas. Over time, these hydrogen bubbles can build up on the surface of the anode, reducing the surface area available for the reaction to occur. This can hinder the flow of current and decrease the efficiency of the voltaic cell.

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• 9.

• A.

Lempeng timbal

• B.

Lempeng timbal dioksida

• C.

Lempeng seng

• D.

Lempeng tembaga

A. Lempeng timbal
Explanation
The correct answer is "lempeng timbal" because in an accumulator, the negative electrode is typically made of lead (timbal). This electrode is responsible for storing and releasing electrons during the charging and discharging process of the accumulator.

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• 10.

• A.

1)

• B.

2)

• C.

3)

• D.

4)