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Class 12 Physics Chapter 7 Alternating Current
The electric mains supply in our homes and offices is a voltage that varies like a sine function with time. Such a voltage is called alternating voltage (ac voltage) and the current driven by it in a circuit is called the alternating current (ac current)*. Today, most of the electrical devices we use require ac voltage. This is mainly because most of the electrical energy sold by power companies is transmitted and distributed as alternating current. The main reason for preferring use of ac voltage over dc voltage is that ac voltages can be easily and efficiently converted from one voltage to the other by means of transformers. Further, electrical energy can also be transmitted economically over long distances. AC circuits exhibit characteristics which are exploited in many devices of daily use. For example, whenever we tune our radio to a favorite station, we are taking advantage of a special property of ac circuits – one of many that you will study in this chapter.
Topics and Subtopics in NCERT Solutions for Class 12 Physics Chapter 7 Alternating Current:
| Section Name | Topic Name |
| 7 | Alternating Current |
| 7.1 | Introduction |
| 7.2 | AC Voltage Applied to a Resistor |
| 7.3 | Representation of AC Current and Voltage by Rotating Vectors — Phasors |
| 7.4 | AC Voltage Applied to an Inductor |
| 7.5 | AC Voltage Applied to a Capacitor |
| 7.6 | AC Voltage Applied to a Series LCR Circuit |
| 7.7 | Power in AC Circuit: The Power Factor |
| 7.8 | LC Oscillations |
| 7.9 | Transformers |
NCERT Solutions for Class 12 Physics Chapter 7 Alternating Current
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( Alternating Current ncert solution )
Having these notes and ncert solution can help the students to prepare and learn various class 12 physics concepts in an effective and easy way. All the diagrams, formulas and derivations are given in these notes to help the students acquaint with all the important chapters and concepts. Plus two physics notes includes a quick summary of the chapter, it saves a lot of time for the students.
Apart from the notes, students are also suggested to solve previous year questions papers and sample papers of physics to know the exam pattern and type of questions properly. Visit the links given below to get the question papers and sample papers.
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