Alternating Current falls under Electricity and Magnetism portion of class 12 physics. Alternating Current Class 12 Physics Notes is designed according to the updated syllabus of 2080 and it covers all the important portion of the chapter. Students can easily prepare their notes, study for test or exams by taking the help of class 12 alternating current Notes.
 Chapter – 19 Â
Alternating CurrentÂ
Alternating current is that current which periodically reverses direction and changes its magnitude with respect to time. Alternating current, abbreviation ac, starts its value from zero and reaches to its maximum, decreases to zero, reverses its direction, attains maximum value and finally comes to zero when it completes one cycle. It repeats its cycle indefinitely.
 Chapter Overview Â
In this chapter we are going to learn the following concepts, ideas or topics;
Now let’s move on to the notes of alternating current. The PDF given below contains all the notes which includes all the topics mentioned in the chapter overview. We request students to use the notes of alternating current wisely for the purpose of making notes and preparing for the board examination.Â
You have to scroll down the PDF to view all the notes of Alternating Current. This PDF contains 20 pages in total which contains all the required notes of alternating current. It doesn’t contains the numerical problems so if you are searching for the numericals then you’ll find them in the next PDF given below.Â
A.C. Instruments
Since alternating current and voltage changes its direction or polarity with respect to time, if ordinary D.C. measuring instruments (ammeter and voltmeter) are used to measure alternating current and alternating voltage, they will show zero reading because the average value of positive and negative half cycles in AC is zero. On the other hand, function of hot wire instruments depends on the heating effect of current and the production of heat is independent of the direction of flow of charge through the resistor. Moreover, heat produced is directly proportional to the square of the current and is always positive. Due to this reason hot – wire instruments are largely used to measure A.C. voltages and currents. These instruments measure the r.m.s voltage or r.m.s current.
Alternating Current Class 12 Physics NumericalsÂ
Those students who want to practice the numericals from alternating current chapter can practice the questions given in the PDF below. We have solved the selected numericals which will provide you the method of solving the numericals.Â
This PDF contains all the important numericals from alternating current chapter. In addition to the numericals it also contains all the required formulas used for solving the numerical problems of this chapter.Â
If you are willing to practise more numerical problems for your examination then you can practice the questions listed below.Â
These questions are provided for practising purposes. So we haven’t provided the solutions of the numerical problems. However, if you are facing problems while solving these numericals then we request you to copy the questions and paste it in Google to get the solutions of that numericals. If that doesn’t work then you can contact us through our telegram channel to get the solutions.
