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