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Nowadays, electricity has become an essential part of our daily life. Almost everything runs on electricity from switching on lights and fans to using mobile phones, laptops and computers. It is used in homes, colleges, factories, hospitals, industries, businesses and even in agriculture. Everyone is so dependent on electricity that even a short power cut can affect our daily routine.
Looking for the best and easy-to-understand NCERT Solutions for Class 10 Science ? You’re in the right place! At Careers360 because here our solutions are designed in a simple and clear way to help you understand each concept with ease. Created by respected subject experts, these answers not only help you with textbook questions but also provide useful tips to boost your preparation .
In Chapter 11 – Electricity, students learn how electric circuits work along with basic concepts like electric current, voltage, resistance, and Ohm’s Law. The solutions help students solve various types of problems, such as calculating the current in a circuit, finding the resistance of materials, and determining the power consumed by electrical devices. This chapter is important not only for exams but also for understanding real-life electrical systems
Understanding Important formulas is very important for understanding the topic well and solving numerical problems. These formulas are used to calculate the current, voltage, power, and resistance.
Current:
Current (I)= Charge(Q)/ Time taken(t)
Voltage:
Voltage(v)= Work Done(W) / Charge(Q)
Resistance:
R= ρl / A= V/I
Where:
ρ = Resistivity, l = length, A = Area
Ohm's Law:
V = I × R
Resistors in Series:
Rt = R1 + R2 + R3 + ...
Resistors in Parallel:
1/Rt = 1/R1 + 1/R2 + 1/R3 + ...
Download - NCERT Class 10 Science: Chapterwise Important Formulas, Diagrams, And Points
This PDF comprises important formulas, diagrams, and key points for each chapter. Utilizing this valuable resource, students can score well in less time and use it for quick revision during weekly tests and exams, ensuring better academic performance.
Solving the CBSE class 10 Questions. So, that students can understand. first will solve the intext Question which covers numerous topics.
Topic:11.1
Q.1 What does an electric circuit mean?
Answer:
A closed and continuous path of electric current is known as the electric circuit. It consists of electric circuit elements like batteries, resistors, etc, and electric devices like a switch and measuring devices like ammeters, etc.
Q.2 Define the unit of currcurrent ent.
Answer:
Ampere(A) is unit of current.1A is flow of 1C of charge through a wire in 1s of time.
current
Q.3 Calculate the number of electrons constituting one coulomb of charge.
Answer:
Given: Q=1C
We know that the charge of an electron
Thus, the number of electrons constituting one coulomb of charge is
Q.1 Name a device that helps to maintain a potential difference across a conductor.
Answer:
Battery, cell or power supply source helps to maintain a potential difference across a conductor.
Q.2 What is meant by saying that the potential difference between two points is 1 V?
Answer:
The potential difference between two points is 1 V means 1 J of work is required to move a charge of amount 1C from one point to another.
Q.3 How much energy is given to each coulomb of charge passing through a 6 V battery?
Answer:
Given: potential difference = 6V and charge =1C.
Thus, 6J energy is given to each coulomb of charge passing through a 6 V battery.
Q.1 On what factors does the resistance of a conductor depend?
Answer:
The resistance of a conductor depends on :
1. Cross-section area of the conductor.
2. Length of conductor
3. The temperature of the conductor.
4. Nature of material of the conductor.
Answer:
We know that resistance is given as
I=length of wire
Resistance is inversely proportional to the area of the cross-section.
Thicker the wire more is cross-sectional area resulting in less resistance resulting in more current flow.
Answer:
By Ohm's law,
I =current
Now, the potential difference is reduced to half i.e.
I' =current
Q.4 Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal?
Answer:
The resistivity of an alloy is higher than pure metal so alloy does not melt at high temperature. Thus, coils of electric toasters and electric irons are made of an alloy rather than a pure metal.
Q.5 Use the data in Table 12.2 to answer the following –
(a) Which among iron and mercury is a better conductor?
(b) Which material is the best conductor?
Answer:
Lower the value of resistivity lower will be the resistance for a material of given area and length. If resistance is law current flow will be high when a potential difference is applied across the conductor.
(a). resistivity of iron
the resistivity of mercury
the resistivity of mercury is more than iron so iron is a better conductor than mercury.
(b)From the table, we can observe silver has the lowest resistivity so it is the best conductor.
Answer:
The schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a
Q.2 Redraw the circuit of Question 1, putting in an ammeter to measure the current through the resistors and a voltmeter to measure the potential difference across the
Answer:
The diagram is as shown :
Resistance of circuit =R=5+8+12=25
Potential = 6V
Now, for 12 ohm resistor, current
By Ohm's law,
The reading of the ammeter is 0.24 A and the voltmeter is 2.88 V.
Q.1 Judge the equivalent resistance when the following are connected in parallel –
(a)
Answer:
(a)
(b)
Answer:
Given :
By Ohm's law,
Hence, the resistance of electric iron is 31.25, and the current through it is 7.04 A.
Answer:
In parallel, there is no division of voltage among the appliances so the potential difference across all appliances is equal and the total effective resistance of a circuit can be reduced. Hence, connecting electrical devices in parallel with the battery is beneficial instead of connecting them in series.
Q.4 How can three resistors of resistances
(a)
Answer:
(a)
(b).1 Ohm
R=Equivalent resistance
Connect all three resistors in parallel
Answer:
(a) the highest total resistance is obtained when all the resistors are connected in a series
Answer :
(b) the lowest total resistance is R is obtained when all the resistors are connected in parallel.
NCERT solutions for class 10 science chapter 11 Electricity topic 11.7
Q. 1. Why does the cord of an electric heater not glow while the heating element does?
Answer:
The heating element of an electric heater is a resistor.
The amount of heat production is given as,
The resistance of elements (alloys) of an electric heater is high. As current flows through this element, it becomes hot and glows red.
The resistance of cord (metal like Cu or Al)of an electric heater is low. As current flow through this element, it does not becomes hot and does not glow red.
Answer:
Given: potential difference = 50 V.
Charge = 9600 C
time = 1 hr=3600 s
Q. 3 An electric iron of resistance
Answer:
Given : resistance
Q.1 What determines the rate at which energy is delivered by a current?
Answer:
The rate at which energy is delivered by a current is power.
Power P=I 2 R, where I is the current and R is the resistance of the circuit/ appliance. Power depends on the current drawn by the appliance and the resistance of the appliance.
Answer:
Given: I= 5 A and V= 220 V.
Power=P=VI
Time
The energy consumed
Power of motor
Energy consumed by motor
Solving the Exercise Problem is a good habit, as it makes you more confident and also decreases the stress for students. So, in this, we will cover All NCERT questions with their proper solution.
(a) 1/25 (b) 1/5 (c) 5 (d) 25
Answer:
Given: A piece of wire of resistance R is cut into five equal parts.
Resistance of each part is
Thus, option D is correct.
Q. 2 . Which of the following terms does not represent electrical power in a circuit?
(a)
Answer:
We know that power
Put,
Pur,
P cannot be
Thus, option B is correct.
Q. 3. An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be
(a) 100 W (b) 75 W (c) 50 W (d) 25 W
Answer:
Given :
The resistance of the bulb
If bulb is operated on 110 Vand resistance is the same, the power consumed will be
Hence, option D is correct.
(a) 1:2 (b) 2:1 (c) 1:4 (d) 4:1
Answer:
If resistors are connected in parallel, the net resistance is given as
If resistors are connected in series, the net resistance is given as
Heat produced
Thus, option C is correct.
Q. 5. How is a voltmeter connected in the circuit to measure the potential difference between two points?
Answer:
A voltmeter should be connected in parallel, to measure the potential difference between two points.
Answer:
Given : diameter
Area
We know
If the diameter is doubled.
Area
We know
Hence, new resistance is
I (amperes) 0.5 1.0 2.0 3.0 4.0
V (volts) 1.6 3.4 6.7 10.2 13.2
Plot a graph between V and I and calculate the resistance of that resistor
Answer:
The plot between voltage and current is as shown :
The slope of the line gives resistance (R)
Answer:
Given : V=12V , I = 2.5 mA = 0.0025 A
Q.9. A battery of 9 V is connected in series with resistors of
Answer: Total resistance
Hence, All resistors are in series so 0.67 A current would flow through the
Q.10. How many
Answer:
Given: V=220V and I =5A
Let
Thus,
Hence, 4 resistors of 176 Ohm are connected in parallel to obtain 44 Ohm.
Q.11. Show how you would connect three resistors, each of resistance
Answer:
(i)
(ii)
Answer:
Given:
Let x be the number of bulbs.
For
Thus,
Hence, 110 bulbs of 4840 Ohm are connected in parallel to obtain 44 Ohm.
Q.13. A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of
Answer:
Given : V=220V and Resistance of each coil=R =24A
When coil is used separately,current in coil is
When two coils are connected in series, net resistance is
current in coil is I'
When two coils are connected in parallel, net resistance is
current in the coil is I"
Q.14. Compare the power used in the
(i) a 6 V battery in series with
(ii) a 4 V battery in parallel with
Answer:
i) Given: V=6V
In, a series current is constant.
So, power
ii) Given:
In, parallel combination voltage in the circuit is constant.
So, power
Answer:
Given :
For lamp one: Power
For lamp two: Power
Thus, the net current drawn from the supply is
Q.16. Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?
Answer:
For TV set :
Given : Power
Energy consumed
For toaster :
Given : Power
Energy consumed
Thus, the TV set uses more energy than a toaster.
Q.17. An electric heater of resistance
Answer:
Given: R=8 Ohm ,I=15A and t= 2hr
The heat developed in the heater is H.
The heat developed in the heater is H .
The rate at which heat is developed is given as
Q.18(a). Explain the following.
(a) Why is the tungsten used almost exclusively for filament of electric lamps?
Answer:
The tungsten used almost exclusively for filament of electric lamps because the melting point of tungsten is very high. The bulb glows at a very high temperature. So tungsten filament does not melt when bulb glows.
Q.18.(b) Explain the following.
Answer:
The conductors of electric heating devices, such as bread toasters and electric irons, are made of an alloy rather than a pure metal because the resistivity of the alloy is more than a pure metal. So the resistance will be hight and the heating effect will be high.
Q.18.(c) Explain the following.
(c) Why is the series arrangement not used for domestic circuits?
Answer:
If any of the elements in the circuit get damaged the entire circuit will be affected. If an element brake there will not be any current flow through the circuit. So the series circuit is not preferred in the domestic circuit.
Q.18.(d) Explain the following.
(d) How does the resistance of a wire vary with its area of cross-section?
Answer:
We know that
Thus, the resistance of a wire is inversely proportional to its area of cross-section.
Q.18.(e) Explain the following.
(e) Why are copper and aluminum wires usually employed for electricity transmission?
Answer:
Copper and aluminum wires are usually employed for electricity transmission because they have low resistivity and they are good conductors of electricity.
Chapter 11 of Class 10 Science is an important part of the syllabus, and each topic plays a valuable role, but here are some key topics that you should focus on. These topics can help you score well in the exam.
Also, students can refer,
Before moving on to the board exam, students must know the types of questions that may be asked from Electricity class 10 NCERT solutions. The following types of questions are commonly found in the exam:
Also, check - NCERT Solutions for Class 10 Maths
Chapter 11 Electricity usually carries around 8 to 10 marks in the exam, based on past trends. In this chapter, you will learn about electric current, its uses, and related concepts.To build a strong foundation and prepare well for your exams make use of NCERT Solutions for Class 10 Science.
Students can also explore NCERT Solutions for all subjects from Class 1 to 12. These solutions are prepared by subject experts and are based on the latest CBSE syllabus and guidelines.
Also, Check NCERT Books and NCERT Syllabus here:
Important Topics - Ohm’s law , Resistivity and Resistance ,Factors that affect the Resistance of a Conductor ,Parallel and Series Combination of Resistors and their applications ,Heating Effect of Electric Current and its Applications.
Resistance is the opposition to the flow of electric current in a wire or device. It depends on the length, thickness, and type of material while Resistivity, on the other hand, is a property of the material itself ,it tells how much a material resists current flow, no matter its size or shape.
.
Admit Card Date:03 February,2025 - 04 April,2025
Admit Card Date:17 February,2025 - 29 March,2025
Admit Card Date:24 February,2025 - 25 March,2025
Hello
Since you are a domicile of Karnataka and have studied under the Karnataka State Board for 11th and 12th , you are eligible for Karnataka State Quota for admission to various colleges in the state.
1. KCET (Karnataka Common Entrance Test): You must appear for the KCET exam, which is required for admission to undergraduate professional courses like engineering, medical, and other streams. Your exam score and rank will determine your eligibility for counseling.
2. Minority Income under 5 Lakh : If you are from a minority community and your family's income is below 5 lakh, you may be eligible for fee concessions or other benefits depending on the specific institution. Some colleges offer reservations or other advantages for students in this category.
3. Counseling and Seat Allocation:
After the KCET exam, you will need to participate in online counseling.
You need to select your preferred colleges and courses.
Seat allocation will be based on your rank , the availability of seats in your chosen colleges and your preferences.
4. Required Documents :
Domicile Certificate (proof that you are a resident of Karnataka).
Income Certificate (for minority category benefits).
Marksheets (11th and 12th from the Karnataka State Board).
KCET Admit Card and Scorecard.
This process will allow you to secure a seat based on your KCET performance and your category .
check link for more details
https://medicine.careers360.com/neet-college-predictor
Hope this helps you .
Hello Aspirant, Hope your doing great, your question was incomplete and regarding what exam your asking.
Yes, scoring above 80% in ICSE Class 10 exams typically meets the requirements to get into the Commerce stream in Class 11th under the CBSE board . Admission criteria can vary between schools, so it is advisable to check the specific requirements of the intended CBSE school. Generally, a good academic record with a score above 80% in ICSE 10th result is considered strong for such transitions.
hello Zaid,
Yes, you can apply for 12th grade as a private candidate .You will need to follow the registration process and fulfill the eligibility criteria set by CBSE for private candidates.If you haven't given the 11th grade exam ,you would be able to appear for the 12th exam directly without having passed 11th grade. you will need to give certain tests in the school you are getting addmission to prove your eligibilty.
best of luck!
According to cbse norms candidates who have completed class 10th, class 11th, have a gap year or have failed class 12th can appear for admission in 12th class.for admission in cbse board you need to clear your 11th class first and you must have studied from CBSE board or any other recognized and equivalent board/school.
You are not eligible for cbse board but you can still do 12th from nios which allow candidates to take admission in 12th class as a private student without completing 11th.
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