Concise Physics Class 9 ICSE Solutions for Chapter 9 - Current Electricity

ICSE Electricity Class 9 has three exercises, namely, 9 (A), 9 (B), and 9 (C). It has a total of 61 questions.

Table of Subtopics in Current Electricity

What Will You Learn in the Chapter Current Electricity?

• Current electricity covers everything about electricity. This chapter explains the electric circuit by using an electric cell and a bulb to introduce the concept of the following:

1. Current.

2. Potential difference.

3. Insulators & Conductors.

4. Closed & Open Circuits.

5. The direction of current flow.

• Introduction of Primary and secondary cell and the difference between them.

• Unit of Electric current.

• Symbols used in circuit diagrams for electric components such as

1. Key

2. Rheostat

3. Voltmeter

4. Resistance

5. Galvanometer

6. Switch

7. Connecting Wires

8. Voltmeter, etc

• Various ways to adapt the use of energy-efficient resources such as LED, CFLs, and modern energy-efficient home appliances

Now, let’s have a look at the solved questions of the Selina book by our experts.

Some Sample Questions And Answers

Q1: State Ohm’s law.

Ans: An electric circuit is formed of three electrical components, they are:

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Ohm’s law states that current ‘I’ flowing through this circuit is inversely proportional to the resistance (R). If there is a voltage (V) increase across it, there is a rise in the current, provided that the resistance doesn’t alter. So, its formula is:

                               V ∝ I

Removing the sign of proportionality, we have:

                     V = IR, which is Ohm’s law  

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Q2: What transformation of energy takes place when current is drawn from a cell?

Ans: The conversion of chemical energy into electrical energy takes place when current is drawn from a cell.

Q3: In the electric circuit drawn below, label the parts A, B, C, D, E, and F. State the function of each part. Depict the current flow direction in the diagram.

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Ans: The question has two parts, which are:

1. The function of each electrical component, and

2. The direction of the current flow

 Let’s discuss one-by-one:

1. The function of each part with the label (Table will be updated soon)

2. The direction of flow of current

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Q3: Write the symbol and state function of Rheostat.

Ans:

1. Symbol of Rheostat:

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2. State Function: Rheostat is an electrical instrument that controls the flow of current by varying the resistance.

Q4: Write the condition necessary for an electric circuit to be closed.

Ans: For an electric circuit to be closed, every component must be made of conductors.

Q5: Name the constituents of a cell.

Ans: The constituents of a cell are: 

1. Two electrolytes.

2. An electrolyte in a vessel.

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