If you are thinking about how you will revise the whole chapter of Electricity before exams, askIITians online free revision notes are the best solution for you. These notes include all the concepts of the NCERT Class 10 Science Chapter 12 that will help you revise all the concepts of this chapter in just 20 minutes. Many times it gets tough to refer to the textbook and look for a topic while you study. If you have CBSE Class 10 revision notes by your side, you can easily look up the concept and do your classwork. You can also revise every topic before exams without reading the whole chapter from the textbook again. The diagrams and tables help in memorising the concepts of the chapter much better.
Class 10 Electricity Chapter includes some basic concepts about charges and electricity that are important for higher studies, especially if you are going to prepare for JEE and NEET. The main concepts included in the Class 10 Revision Notes for Chapter 12 Electricity include current, potential difference, resistance, Ohm’s law, rheostat, resistivity, resistors in series and parallel combinations, the heating effect of electric current, Joule’s law, electric fuse, electric power, etc. Each of these topics is explained in pointwise format with the help of diagrams and tables. You can learn every topic of this chapter easily with our free revision notes for CBSE Class 10 Science Chapter Electricity.
Protons and electrons possess some charge. Protons have a positive charge. Electrons have a negative charge. Neutron does not possess any charge. Like charges repel each other and unlike charges attract each other.
Conductors are those materials in which electrons can move freely. All metals are conductors. Insulators do not have any free electrons to move. For example, wood and plastic.
The flow of electric charge is known as Electric Current. It is expressed in terms of the rate of flow of charges.
The SI unit of electric current is Ampere (A).
Work done per unit charge when taking charge from one point to another is known as the Potential Difference. The unit of potential difference is volt (V). 1V is defined as the potential difference between two points if 1 Joule of work is done to move 1-coulomb charge from one point to another.
The potential difference between the two points is directly proportional to the current, provided the temperature is constant.
V ∝ l
⇒ V = lR
R is a constant known as Resistance. The SI unit of resistance is the ohm (Ω)
Factors on which resistance of a conductor depends-
Resistivity is the property of the material. The SI unit of resistivity is ohm-metre.
When two or more resistors are joined in series, then their total resistance is given by the formula-
RS = R1 + R2 + R3
The current will remain the same through all resistors. Total voltage is given by-
V = V1 + V2 + V3
Voltage across each resistor is given as –
V1 = lR1
V2 = lR2 [V1 + V2 + V3 = V]
V3 = lR3V = lR
⇒ V = lR1 + lR2 + lR3
lR = l(R1+ R2 + R3)
R = R1 + R2 + R3
In this case, voltage is the same across each resistor and is equal to the applied voltage. The total current is given as-
V/R = V/R1 + V/R2 + V/R3
1/Rp = 1/R1 + 1/R2 + 1/R3
Advantages of Parallel Combination over Series Combination
If one component fails in a series combination, then the complete circuit is broken and no component can work properly. Different appliances need different currents.
Heating effects of Electric Current
When charge Q moves against the potential difference V in time t, the amount of work is given by-
H = l2 Rt
The rate at which electric energy is dissipated or consumed in an electric current. The SI unit of power is Watt.
P = Vl
⇒ P = l2 R = V2/R
The commercial unit of electric energy is a kilowatt-hour (KWh).
Revision notes for the Class 10 Electricity chapter are created by Science experts in an easy to understand format. Once you read these revision notes, there is no need to refer to your textbook again and again. These notes can help you revise the chapter in just 20 minutes. They include the latest syllabus of Class 10 Science.
The main concepts of this chapter that will help you in higher classes are potential difference, Ohm’s law, resistivity, resistors in parallel and series combinations, the heating effect of electric current, and power. You must use our free revision notes for Class 10 CBSE Chapter 12 Electricity to revise these concepts.
If you want to create your notes for this chapter you must have a thorough understanding of every topic. We recommend you read the NCERT chapter and underline all the key concepts or definitions. Write down those concepts in your language in pointwise format and create your notes. You can also seek help from our free revision notes. They are written in simplified language and cover all the points of the chapter.
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