{"id":138802,"date":"2022-04-11T17:30:57","date_gmt":"2022-04-11T12:00:57","guid":{"rendered":"https:\/\/www.aakash.ac.in\/blog\/?p=138802"},"modified":"2023-04-03T12:45:20","modified_gmt":"2023-04-03T07:15:20","slug":"what-is-electric-power-cbse-class-10-physics-notes","status":"publish","type":"post","link":"https:\/\/www.aakash.ac.in\/blog\/what-is-electric-power-cbse-class-10-physics-notes\/","title":{"rendered":"What is Electric Power? CBSE Class 10 Physics notes"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Science is an important subject concerning the CBSE class 10th exam. Preparing for the 10th exam involves hard work and dedication to study every subject covering all the chapters mentioned in the syllabus.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">CBSE 10th science consists of 16 chapters in all. Out of which four chapters are from Physics. Physics being an interesting subject can help you score well in the CBSE 10th Science exam. Due to the numerical questions asked in this section, students can score full marks if they have their concepts clear.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chapter 12 from the CBSE 10th Science deals with the concept of electricity. Learning the concepts from this chapter becomes easier as students can relate the concepts to the use of electricity in their daily life. Having clear concepts from this chapter will help the students secure marks that would fetch them a good score in the CBSE 10th exam. Students are also expected to study this chapter from the <\/span><a href=\"https:\/\/www.aakash.ac.in\/ncert-solutions\/class-10\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">NCERT solutions for CBSE class 10th<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Electricity has become an integral part of our lives in this modern world. We use electricity for almost everything. Thus, we must study the concepts related to electricity. Read this article to get a clear idea of the concepts discussed in the chapter Electricity from the CBSE class 10th Science. Following mentioned are a few basic concepts from this chapter:<\/span><\/p>\n<h3>Basics of electricity<\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Electric current (I): <\/b><span style=\"font-weight: 400;\">The rate of flow of electric charge through a conductor is called electric current. A charge is a fundamental positive or negative particle of an atom.<\/span><b>\u00a0<\/b><\/li>\n<\/ul>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Electric circuit: <\/b><span style=\"font-weight: 400;\">Electric current flows when there is a continuous path present. This continuous path which allows the electric current to flow through it is an electric circuit. A switch is used to make or break the path of an electric circuit.<\/span><\/li>\n<\/ul>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Electric potential is defined as the amount of work done to move a unit charge from a reference point to a specific point against an electric field.<\/span><\/li>\n<\/ul>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Potential difference (V): <\/b><span style=\"font-weight: 400;\">Potential difference is the work done to move a unit charge from one point to another. It is denoted by V.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">V= W\/Q<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Current always flows from a point at the higher potential to a point at the lower potential.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Resistance(R): <\/b><span style=\"font-weight: 400;\">It is the property of a conductor to resist the flow of current through it.<\/span><\/li>\n<\/ul>\n<h3>Ohm&#8217;s Law<\/h3>\n<p><span style=\"font-weight: 400;\">The law states that the current flowing through an ideal conductor is directly proportional to the potential difference across the ends, provided that the temperature remains constant.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V = IR<\/span><\/p>\n<p><span style=\"font-weight: 400;\">To get an in-depth knowledge of the chapter, go through the <\/span><a href=\"https:\/\/www.aakash.ac.in\/important-concepts\/physics\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">CBSE 10 Physics concepts<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h3>Factors affecting the resistance of a conductor<\/h3>\n<p><span style=\"font-weight: 400;\">The resistance of a conductor depends on several factors. The resistance either increases or decreases with a change in these factors.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">To be precise, the resistance of any conductor depends on :<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The length of the conductor<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The cross-sectional area of the conductor<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Nature of the material used in the conductor<\/span><\/li>\n<\/ol>\n<p><span style=\"font-weight: 400;\">Observations show that the resistance of a metallic conductor is directly proportional to its length and inversely proportional to the cross-sectional area of the conductor. The material used in the conductor determines its resistance by a property of the material called the resistivity of that material with an SI unit as Ohm metre.\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Metals and alloys, which are good conductors of electricity, have a low resistivity value, whereas insulators like rubber and wood have a high resistivity value.<\/span><\/p>\n<h3>Heating effect of electric current<\/h3>\n<p><span style=\"font-weight: 400;\">It is common to observe that electric appliances get heated up when used for a long time. The heating up of electrical appliances is due to the source of energy. The energy from the source is being used up to perform the functions of the appliances. However, energy also gets expanded to increase the temperature due to the presence of resistors. This heating up of the appliances is called the heating effect of electric current.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">When the circuit is purely resistive, the energy from the source is continuously used up to increase the temperature. The heating effect in such circuits is used in appliances like electric heaters, electric iron, electric geysers etc.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Consider a current I flowing through a resistor of resistance R with a potential difference V and Q is the charge that flows for time t then the power input to the source is<\/span><\/p>\n<p><span style=\"font-weight: 400;\">P = VQ\/t=VI<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The energy supplied to the circuit is P\u00d7t which is the same as VIt. This energy is nothing but the heat produced. Thus, heat H is shown as<\/span><\/p>\n<p><span style=\"font-weight: 400;\">H = VIt<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Applying Ohm&#8217;s law here,\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">H = I<\/span><span style=\"font-weight: 400;\">2<\/span><span style=\"font-weight: 400;\">Rt<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The above equation shows that heat produced in a resistor is directly proportional to the square of current passing through the resistance, the resistance of the given current and the time for which the charges flow through the circuit.<\/span><\/p>\n<h3>Electric Power<\/h3>\n<p><span style=\"font-weight: 400;\">Similar to mechanical power, electric power is defined as the rate of doing work. Electric power (P) is thus the rate at which an electric circuit per unit time dissipates the electrical energy.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00a0Power (P) = VI<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V = IR<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Therefore, P = <\/span><span style=\"font-weight: 400;\">I<\/span><span style=\"font-weight: 400;\">2<\/span><span style=\"font-weight: 400;\">R<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Also, I = V\/R<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Therefore, P = <\/span><span style=\"font-weight: 400;\">V<\/span><span style=\"font-weight: 400;\">2<\/span><span style=\"font-weight: 400;\">\/ R<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Usually, electric generators are used to produce electric power. However, devices such as electric batteries can be used to supply electric power.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Electric power grids are installed to supply electricity for domestic and industrial use.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Watt is the SI unit of electric power. For instance, if one joule of energy is used for one second, electric power equals 1 watt.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">While watt is a very small unit, in day to day life, we use a larger unit which is 1 kilowatt. Electric energy is a product of electric power and time with a unit as watt-hour(W h). When 1 watt of power is used for 1 hour, 1 Watt-hour of energy is consumed.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The electric energy used commercially is usually described in kilowatt-hour(kW h), commonly known as units.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">1 kW h = 1000 watt * 3600 seconds<\/span><\/p>\n<p><span style=\"font-weight: 400;\">= 3.6 * 10<\/span><span style=\"font-weight: 400;\">6<\/span><span style=\"font-weight: 400;\"> watt seconds<\/span><\/p>\n<p><span style=\"font-weight: 400;\">= 3.6 * 10<\/span><span style=\"font-weight: 400;\">6<\/span><span style=\"font-weight: 400;\"> joule<\/span><\/p>\n<h3>Conclusion<\/h3>\n<p><span style=\"font-weight: 400;\">Chapter 12 from the CBSE class 10th Science is a detailed description of some of the <\/span><a href=\"https:\/\/www.aakash.ac.in\/important-concepts\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">important concepts<\/span><\/a><span style=\"font-weight: 400;\"> related to electricity. It discusses various facts and terminologies of electricity.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Students are expected to solve numerical questions based on this topic to score well in their exams. The numerous questions solved in the <\/span><a href=\"https:\/\/www.aakash.ac.in\/ncert-solutions\/class-10\/science\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">NCERT solutions for class 10 science<\/span><\/a><span style=\"font-weight: 400;\"> from this chapter will help students practice and prepare the topic well.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">To thoroughly practise the chapter, solve the sample papers and <\/span><a href=\"https:\/\/www.aakash.ac.in\/10th-cbseboard-previousyears-questionanswers-free\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">previous years&#8217; question papers for CBSE 10th<\/span><\/a><span style=\"font-weight: 400;\">. It will help students to be great at scoring their exams.<\/span><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Science is an important subject concerning the CBSE class 10th exam. Preparing for the 10th exam involves hard work and dedication to study every subject covering all the chapters mentioned in the syllabus.\u00a0 CBSE 10th science consists of 16 chapters in all. Out of which four chapters are from Physics. Physics being an interesting subject [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":132692,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3581],"tags":[29,1793,1568,2861,2860],"class_list":["post-138802","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cbse","tag-board-exams","tag-cbse-board-exams","tag-cbse-class-10","tag-cbse-class-10-physics","tag-class-10-physics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is Electric Power? CBSE Class 10 Physics notes<\/title>\n<meta name=\"description\" content=\"Are you preparing for CBSE Class 10 Physics Board Exam? 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