Jul 02, 2019 alternating current class 12 notes chapter 7. Alternating current circuits and electromagnetic waves. Ohms law yields v c ix c, where v c is the rms voltage across the capacitor and i is the rms current in the circuit consider a circuit with only an inductor and an ac generator. Learn about the different concepts of alternating current only at byjus. Lesson 7 alternating current alternating current as we have seen earlier a rotating coil in a magnetic field, induces an alternating emf and hence an alternating current. Class 12 physics revision notes for chapter 7 alternating current. Alternating current class 12 notes chapter 7 learn cbse. Pdfdownload iit jee handwritten notes physics jeemain. With the help of notes, candidates can plan their strategy for particular weaker section of the subject and study hard. Notes for alternating current circuit chapter of class 12 physics. Rms values since voltage and current are always changing we need some way of averaging out their effect. Important terms associated with an alternating quantity are defined below.
Class 12 physics notes chapter 7 alternating current cbse class 12 physics notes pdf. Notes for electromagnetic induction chapter of class 12 physics. The dc can be considered a particular case of the general ac, with frequency equal to zero. So, go ahead and check the important notes for class 12 physics alternating currents. Electromagnetic induction and alternating current class 12 pdf download. Figure shows the plots of the current and voltage as a function of time for the inductor. Learn more problems of rms voltage, peak current, total power, source frequency by ncert at byju. Download revision notes for alternating current class 12 notes and score high in exams. Electromagnetic induction and alternating current class 12 pdf do.
Westinghouse was convinced that the technology of alternating current was the key to the. Why, alternating current and direct current, of course. Class 12 physics notes chapter 7 alternating current pdf download free. Figure 1 shows the plot of alternating voltage and alternating current as a function of time in a circuit that has only a resistor and a source of alternating current an ac generator. Electromagnetic induction and alternating current revision notes. It can be represented as, the currents and voltages in a. In fact, the i or rms current is the equivalent dc current that would produce the same average power loss as the alternating current. The frequency of an alternated circuit is measured by the number of times the.
Download cbse notes, neet notes, engineering notes, mba notes and a lot more from our website and app. Notes on alternating current class 12 page 01 alternating current a. The rms value of alternating current is defined as that value of the steady current, which when passed through a resistor. Dec 24, 2019 candidates who are pursuing in class 12 are advised to revise the notes from this post. Alternating current is defined as the current that varies like a sine function with time. All educational material on the website has been prepared by the best teachers having more than 20 years of teaching experience in various schools.
Get pdf download of class 12 physics chapter 7 alternating current class 12 notes, video lectures and more made by expert teachers of vidyakul to score high marks in your exams. C is the current that changes in magnitude direction continuously with respect to time. Electromagnetic induction and alternating current class 12. Download cbse class 12th revision notes for chapter 7 alternating current in pdf format for free. Rms value, average value, peak factor and form factor of half wave rectified alternating current. Note again that the voltage and current are not in phase. Due to this reason the rms value of current is also known as effective or virtual value of current. Class 12 physics chapter 7 alternating current notes pdf download alternating current ac is the current generated by the vast majority of power plants and used by most power distribution systems, as it is cheaper to generate and has fewer energy losses than direct current when transmitting electricity over long distances. Both ac and dc describe types of current flow in a circuit. State the differences between ac and dc voltage and current. Alternating current, ac and direct current, dc both have their advantages and disadvantages, but this means that there is a choice to select the best option for any given use or application. In a simple circuit that is used to light a bulb with a battery, the battery provides direct currenta current flowing in only one direction.
Candidates who are ambitious to qualify the class 12 with good score can check this article for notes. May 26, 2019 in alternating current circuit, the ratio of emf applied and consequent current produced is called the impedance and is denoted by z, i. Cbse class 12 physics chapter 7 notes alternating current. This article is concerned with the analysis of simple direct current circuits of two types. The direction of current will be clockwise and anticlockwise and it will. The value of current will oscillate between a maximum value and a minimum value. Thomas edison, on the other hand, had constructed 121 dc power stations in the united states by 1887. Half wave rectified alternating current is one whose onehalf cycle has been suppressed i. An ac generator is a conducting coil rotating in a magnetic field. The rms value of alternating current is defined as that value of the steady current, which when passed through a resistor for a given time, will generate the same amount of heat as generated by an alternating current when passed through the same resistor for the same time. In case of ac the current is changing its magnitude at every instant of time.
In fact there are certain types of works for which alternating current is unsuitable and, therefore, direct current is absolutely necessary such as for electroplating, charging of storage batteries, refining of copper, refining of aluminium, electrotyping, production of. These are the alternating current class 12 notes prepared by team of expert teachers. Electric charge in alternating current ac, on the other hand, changes direction. Class 12 important questions physics chapter 7 alternating current. Cbse class 12 physics chapter 7 alternating current notes in pdf are available for free download in mycbseguide mobile app. Iit jee handwritten notes pdf for class 11 and class12 physics jee notes of alternating current. In particular, if a coil rotates in the presence of a magnetic field, the induced emf varies sinusoidally with time and leads to an alternating current ac, and provides a source of ac. Cbse notes class 12 physics current electricity aglasem. Alternating current 235 george westinghouse 1846 1914 george westinghouse 1846 1914 a leading proponent of the use of alternating current over direct current.
Home up board question papers ncert solutions cbse papers cbse notes ncert books motivational. Alternating current class 12 notes physics mycbseguide. Class 12 chap 7 alternating current 01 ii ac dc current. As it will be shown later, alternators operate with both alternating ac and directcurrent dc electric power. Alternatingcurrent circuits summary physics libretexts.
Cbse class 12 physics notes alternating current cbse and ncert students can refer to the attached file. Class 12 physics current electricity get here the notes for class 12 physics current electricity. Chapter 31 alternating current phasors and alternating currents resistance and reactance magneticfield energy the lrc series circuit power in alternatingcurrent circuits resonance in alternatingcurrent circuits transformers. It is crucial to note that the maximum amplitude of the ac voltage source is not equal to the sum of the maximum voltage amplitudes across the three circuit. Aug 19, 2019 unsubscribe from physics wallah alakh pandey. Alternating series test we have the following test for such alternating series. Alternating current vs direct current as useful and as easy to understand as dc is, it is not the only kind of electricity in use. Class 12 physics revision notes for chapter 7 alternating. Class 12 physics notes chapter 7 alternating current pdf cbse.
Home iit books download download allen physics chapter wise notes and problems with solutions. I we see from the graph that because the values of b n are decreasing, the. However, it is possible to convert the alternating current that is induced into the armature into a form of direct current. Basic concepts of alternating current cedengineering. In direct current dc, the electric charge current only flows in one direction. This conversion of ac into dc is accomplished through the use of a commutator. Thus, he came into conflict with thomas alva edison, an advocate of direct current.
Candidates who are pursuing in class 12 are advised to revise the notes from this post. Cbse ncert notes class 12 physics alternating current. Fundamentals of alternating current electrical engineering. This is possible only when you have the best cbse class 12 physics study material and a smart preparation plan. A current which flows first in one direction in a circuit, called the positive direction, then in the reverse direction or negative direction is called alternating current.
Certain sources of electricity most notably, rotary electromechanical generators naturally produce voltages alternating in polarity, reversing positive and negative over time. The rms value is also called effective value of an a. Note that your fingers point in the direction that the north. Jun, 2018 these notes have the solution of numerical problems, solved exercise short questions and easy wording theory all in one pdf. Magnetic flux magnetic flux through an area in a magnetic field is defined as a magnetic field is visualized by drawing lines of field, which are imaginary. In 1886, ganz works, an electric company located in budapest, electrified all of rome with ac. Determine the rms value of the current in the circuit. Fundamentals of alternating current 3 figure 121 sinusoidal wave values. Cbse class 12 physics notes alternating current concepts. Answers of assignment are given at the end of each assignment with complete solutions. Cbse notes for class 12 physics alternating current provide a detailed insight into the topic. Mar 05, 2019 class 12 physics notes chapter 7 alternating current. Class 12 physics notes chapter 7 alternating current pdf.