Social Sciences, asked by kulwantsingh0033, 10 months ago

a) Do NCERT Intext and Exercise Question Answers on A4 sheets of following chapter (i)Electricity​

Answers

Answered by diyamaria1108
2

Answer:

Explanation:

1. What does an electric circuit mean?

A continuous closed path made of electric components through which an electric current flows is known as an electric circuit. A simple circuit consists of the following components:

(a) Conductors

(b) Cell

(c) Switch

(d) Load

2. Define the unit of current.

Solution:

The unit of current is ampere. Ampere is defined by the flow of one coulomb of charge per second.

. Calculate the number of electrons constituting one coulomb of charge.

Solution:

The value of the charge of an electron is 1.6 × 10-19 C.

According to charge quantization,

Q = nqe, where n is the number of electrons and qe is the charge of an electron.

1C = n x  1.6 x 10

Therefore, the number of electrons constituting one coulomb of charge is 25 × 1018.

Therefore, the number of electrons constituting one coulomb of charge is 25 × 1018.

In text 12.2 Page: 202

1. Name a device that helps to maintain a potential difference across a conductor.

Solution:

Battery consisting of one or more electric cells is one of the devices that help to maintain a potential difference across a conductor.

2. What is meant by saying that the potential difference between two points is 1 V?

Solution:

When 1 J of work is done to move a charge of 1 C from one point to another, it is said that the potential difference between two points is 1 V.

3. How much energy is given to each coulomb of charge passing through a 6 V battery?

Solution:

We know that the potential difference between two points is given by the equation,

V = W/Q, where,

W is the work done in moving the charge from one point to another

Q is the charge

From the above equation, we can find the energy given to each coulomb as follows:

W = V × Q

Substituting the values in the equation, we get

W = 6V × 1C = 6 J

Hence, 6 J of energy is given to each coulomb of charge passing through a 6 V of battery

1. Name a device that helps to maintain a potential difference across a conductor.

Solution:

Battery consisting of one or more electric cells is one of the devices that help to maintain a potential difference across a conductor.

2. What is meant by saying that the potential difference between two points is 1 V?

Solution:

When 1 J of work is done to move a charge of 1 C from one point to another, it is said that the potential difference between two points is 1 V.

3. How much energy is given to each coulomb of charge passing through a 6 V battery?

Solution:

We know that the potential difference between two points is given by the equation,

V = W/Q, where,

W is the work done in moving the charge from one point to another

Q is the charge

From the above equation, we can find the energy given to each coulomb as follows:

W = V × Q

Substituting the values in the equation, we get

W = 6V × 1C = 6 J

Hence, 6 J of energy is given to each coulomb of charge passing through a 6 V of battery.

In text 12.5 Page: 209

1. On what factors does the resistance of a conductor depend?

Solution:

The resistance of the conductor depends on the following factors:

a. Temperature of the conductor

b. Cross-sectional area of the conductor

c. Length of the conductor

d. Nature of the material of the conductor

2. Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?

Solution:

Resistance is given by the equation,

R = ρ l/A

where,

ρ is the resistivity of the material of the wire,

l is the length of the wire

A is the area of the cross-section of the wire.

From the equation, it is evident that the area of the cross-section of wire is inversely proportional to the resistance. Therefore, thinner the wire, more the resistance and vice versa. Hence, current flows more easily through a thick wire than a thin wire.

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