NCERT Solutions for Class 10 Science Chapter 12: electricity
Class 10 Science Chapter 12 is about electricity. Electricity is one of the most fundamental needs of our society. Electricity has shaped our civilization ever since the dawn of the industrial revolution, powering entire industries and businesses. Today, we can’t think of life without electricity, it’s an indispensable resource.
NCERT Solutions for Class 10 Science Chapter 12, provided by Extramarks, explains the essential concepts of electricity, electric current and circuit, circuit diagram, how electricity works at the molecular level, applications of electricity, etc. These solutions strive to impart maximum informational value and answers to all the textbook questions. Referring and practicing thoroughly to our Class 10 Science NCERT Solutions Chapter 12 can help students score high in-class tests and in the CBSE board examination.
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Key Topics Covered In NCERT Solutions for Class 10 Science Chapter 12
Our NCERT Solutions for Chapter 12 Science Class 10 discusses electricity-related topics in great detail.
Following are the key topics covered in this chapter:
Electricity
Definition:
electricity is the amount of the flow of charges in a conductor and is part of electromagnetism. A few common phenomena associated with electricity include magnetism, lightning, static electricity, electric discharges and electric heating.
Any object with moving electric charges, either positive or negative, creates both electric and magnetic fields giving rise to electric current. A magnitude force will act on that object when a charge is placed in a non-zero electric field. Coulomb’s law explains the magnitude of force. Hence, the electric field will work on the electric charge when the charges move.
Best Electricity Conductors:
Metals like Aluminium, Gold, Silver, Copper, Steel, and Brass are considered the best electricity conductors. Students can learn more about good conductors and bad conductors from our NCERT Solutions for Class 10 Science Chapter 12.
Sources of electricity:
The two types of electricity are:
- Static electricity: Static electricity is generated by rubbing two or more objects to build friction. The first observations of this electrical phenomenon were made in ancient Greece by Thales of Miletus when amber bars were rubbed against tanned skin, which produced an attractive characteristic.
- Current electricity: This type of electricity is produced by the flow of electric charges in a conductor. This is one of the most accurate sources of electricity. Examples of generating current electricity include:
- The pressure applied by underground water flow is used as alternative energy in large ships to the central system.
- electricity in dams is produced by releasing a controlled flow of high-pressure water through a forced conduit.
- The water drives turbines that move the generators, producing an electric current. This low-voltage of high current passes through a voltage booster, transforming it into electricity.
The topic and difference between static electricity and current electricity has been elaborated by our Science subject matter experts in our NCERT Solutions for Class 10 Science Chapter 12. Students can register at Extramarks’ website and gain access to our study solutions that can help them understand the important points easily and make them revise quickly.
Electric Current and Circuit
As defined in our Class 10 Science Chapter 12 NCERT Solutions, Electric Current is the rate at which the electrons flow in a conductor. Electric current is measured in Ampere. Electrons are tiny particles that are within the molecular structure of a substance. Sometimes, these electrons are tightly held, and sometimes loosely. When the nucleus loosely holds electrons, they can travel freely within the body’s limits.
Electrons are negatively charged particles. When they move, several other particles move and this movement of electrons is known as electric current. We should note that the number of electrons that can move controls the capacity of a substance to produce electricity.
Some materials let current move better than others.
Based on the power of the material to conduct electricity, they are classified into two categories:
1. Conductors:
The materials allow the free flow of electrons from one particle to another. The flow of electrons inside the conductor generates an electric current. The force required to drive the current flow through the conductor is voltage.
Examples of conductors include the human body and metals like iron, silver, gold, brass and copper.
2. Insulators:
Insulators are materials that restrict the free flow of electrons from one particle to another. Eventually, the charge is seldom distributed evenly across the surface of an insulator.
Examples of insulators are plastic, glass, and wood.
Further in our NCERT Solutions for Class 10 Science Chapter 12, the prerequisites for the electric current to flow in a conductor are discussed and understood through a circuit. The circuit comprises an energy source like a battery that produces voltage. Voltage creates pressure, also known as the electromotive force, on the electrons, channeling them to flow in a single direction.
The circuit is a closed loop through which electrons flow. A circuit is said to be closed when a switch is turned on.
Electric Potential and Potential Difference
Electric potential is a point in an electric field which is the work done in moving a unit of electric charge from infinity to that point opposite of electric forces.
On the other hand, a potential difference between two points in an electric field is the work done in moving a unit of electric charge from one point to another point against the electric force.
Potential difference= work done/charges i.e, V=W/Q.
Circuit Diagram
A circuit diagram is an electrical diagram of the components of an electrical circuit. In other words, it’s a graphical representation of an electrical circuit that shows actual electrical connections. It shows the respective positions of all the components and their link to one another. Given below is an example of a simple circuit diagram.
Components of Circuit Diagram:
- Electric cell: It is the source of current. The large terminal is positive, and the small terminal is negative.
- Battery: The utility of this is equal to a cell.
- Switch: Used to start or stop the current flow upon being pressed.
- Wire Joint: Used to connect the devices, represented by drawing ‘blobs’ at the connection point.
- Wires crossing without joining: In this, the cables do not touch each other and are shown without ‘blobs.’
- Electric bulb: Devices used to glow using electricity.
- Resistor (R): It controls the amount of current flow in the circuit.
- Variable resistance: Regulating the amount of current flow by increasing or decreasing the resistance is done using variable resistance. It is also known as a rheostat.
- Ammeter: The ammeter measures the current passing at a particular point.
- A voltmeter measures the voltage between two points in a circuit.
Circuit diagrams are very important for understanding a lot of future concepts and theories in Physics. Our subject matter experts have explained the circuit diagram with a step-by-step explanation and illustrated it with examples for students to comprehend this easily. We recommend students to sign up at Extramarks’ website and check out what we have in store for them. Besides NCERT Solutions for Class 10 Science Chapter 12, every student registered at Extramarks can access study materials on all subjects and boost their academic performance.
Ohm’S Law
Georg Simon Ohm was the first to verify Ohm’s law experimentally. The law explains the relationship between electric current and potential difference. The current that flows through the conductors is directly proportional to its voltage, provided the physical condition and the temperature remain constant.
The law equation is V=IR, where V is the voltage, I is the current flowing through the conductor, and R is the resistance.
Applications of Ohm’s law:
- To ascertain the voltage, resistance or current of an electric circuit.
- To maintain the required voltage drop across the electronic devices.
- Used in DC ammeter and DC shunts to reroute the current.
Constraints of Ohm’s Law:
- Electrical elements like diodes and transistors only allow the current to flow through in one direction. Hence Ohm’s law cannot be applied here.
- The voltage and current are not constant with time for non-linear electrical elements with parameters like capacitance, resistance, etc., making it challenging to apply Ohm’s law.
Ohm’s Law will be extensively used in higher grades in the Science stream and we recommend students check their understanding by solving sample papers, Long and short questions, and MCQs to strengthen their understanding from our NCERT Solutions for Class 10 Science Chapter 12. Solutions cover various concepts of the chapter and are considered ideal study material for examinations and scoring high marks. No wonder students have complete faith and trust in Extramarks
Factors affecting the Resistance of a Conductor
Resistance is the polarity of the flow of electrical current through a conductor. Resistance = Potential difference/ Current. The resistance of the conductor depends on factors like the temperature of the conductor, length of the conductor, type of material of the conductor and the cross-sectional area.
Resistance of A System of Resistors
A resistor is a non-resistant two-terminal electrical component that works as an electrical resistance in the circuit. Resistors decrease the electric charges and voltage levels within circuits. Almost all the circuits often have more than one resistor.
The two most direct connections of resistors are:
- Resistors in series:
When an exact amount of current flows through the resistor, but the voltage across each resistor is different, the circuit is connected in series, as shown below.
The total resistance is calculated as Rtotal=R1+R2+…..+Rn. In this type of connection, if the resistor or any other component is broken, the entire circuit is turned off
- Resistors in Parallel:
- The voltage remains the same, and the electric current is branched out and recombined when the branches meet at the same point. If a resistor or other component appears broken, it can be disconnected easily without affecting other elements in a parallel circuit. The total resistance is calculated as 1/Rtotal=1/R1+1/R2+…..+1/Rn.
Heating Effect Of Electric Current
The heating effect of Electric Current is experienced; by passing an electric current through a conductor, the conductor becomes hot and generates heat. This application is widely used across devices like electric coils, bulbs, iron, heater, fuse, etc.
Electric Power
Chapter 12 Science Class 10 defines electric power as the rate of energy transformed into an electrical circuit. Simply put, it measures how much energy is used in a period. The equation of electric power is P=VI, where P is the power, V is the potential difference, and I is the electric current.
NCERT Solutions for Class 10 Science Chapter 12: Exercises & Solutions
NCERT Solutions for Class 10 Science Chapter 12, provided by Extramarks, covers all essential topics from the examination point of view. Our NCERT Solutions comprises chapter notes, various questions such as MCQs, short and long answer questions, and their solutions, revision notes, etc. Students may refer to and practise different types of questions consolidated in NCERT Solutions for Class 10 Science Chapter 12 by clicking on the link given below.
NCERT Solutions – Short-answer Questions
NCERT Solutions – MCQ’s
NCERT Solutions – Long-answer Questions
Furthermore, in addition to NCERT Solutions for Class 10 Science Chapter 12, students may access NCERT Solutions for all other chapters. Students may click on the respective links to refer to NCERT Solutions for other classes from 1 to 12. Students need to make use of these solutions to excel in academics and stay ahead of the pack.
NCERT Solutions Class 10 Science Exemplar
By practicing these advanced level of NCERT Exemplar questions, students can have better clarity on the concepts like Electric Current and Circuit, Factors affecting the Resistance of a Conductor, etc., and also develop better problem-solving skills to be confident in facing all types of questions in the examination.
The Exemplar book is a collection of a variety of questions for students to practice and become strong in their respective subjects. Students can enjoy a repository of questions covered in Exemplars – MCQs, short answer questions, long format questions, etc.
While solving the questions from Exemplar, students will also get to revise key topics of the chapter. They will understand where they lack or need little more practice. . Students can clear their doubts with the help of detailed and authentic solutions and become more confident.
Students can first study the chapter from the NCERT textbook and refer to our NCERT Solutions for Class 10 Science Chapter 12. Then they can solve questions given in NCERT Exemplar. This way students will have a comprehensive understanding of the electricity chapter. Our study notes also contain solutions for all the chapters covered in NCERT textbooks
Furthermore, students can refer to the chapter-wise Exemplar questions and solutions for Class 10 Science, available on the Extramarks’ website.
- NCERT Solutions Class 10 Science – Exemplar Questions and Answers
Key features of NCERT Solutions for Class 10 Science Chapter 12
Extramarks is one of the best online learning platforms for a wide range of subjects for lakhs of students from Classes 1 to 12. Our academic research team has prepared the study materials based on the latest CBSE syllabus and as per the NCERT guidelines. Students can confidently rely on our learning solutions for their studies and exam preparation.
Benefits of NCERT Solutions for Class 10 Science Chapter 12 include:
- Our NCERT Solutions are structured to present all the Chapter 12 topics in an easy-to-understand language and provide authentic, reliable and to-the-point study material. .
- NCERT Solutions provides detailed Solutions to the chapter questions that help students to fetch more marks in the examinations. It helps them to continue their learning experience with Extramarks which tries to do away with rote learning and supplements their studies with experiential learning and other innovative educational materials.
- The notes are prepared by highly qualified and experienced faculty with decades of experience to make you understand the concepts easily and effectively.
- Our NCERT Solutions for Class 10 Science Chapter 12 provides well-explained answers to all the questions in the textbook. Also, the tricky in-text questions wherein apply the concepts learned in the chapter.
- The content on NCERT Solutions provided by Extramarks is regularly updated as per the CBSE Board and the NCERT syllabus.