Physics is a very important subject for students. It may be hard for some students. For helping students here we have shared NCERT Class 12 Physics Chapter 7 Alternating Current Handwritten Notes.
The Alternating Current notes is a best resource for students who are preparing for their board exam because it compile the entire lesson in short and include every important topic.
NCERT Class 12 Physics Chapter 7 Alternating Current Notes
Next Chapter: Electromagnetic Waves
Previous Chapter: Electromagnetic Induction
Other Subjects:
Class 12 Biology Notes
Class 12 Chemistry Notes
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Alternating Current Notes PDF
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Key Points: Alternating Current Notes PDF
Alternating EMF An electromotive force (emf) whose magnitude changes continuously with time and whose direction reverses periodically is know as an alternating emf.
Alternating Current:
Alternating current (Ac) is an electric current that periodically reverses its direction , and changes its magnitude continuously with time.
RMS value of alternating emf :
The root means square (rms) value of alternating e.m.f. is defined as the Value of Steady voltage, which would generate the same amount of heat in the same Resistance in a given time.
Inductive reactance :
Inductive reactance is the name given to the opposition (by inductor) to a changing current flow. This is measured in ohms, Just like resistance.
Resonance in RLC Series circuit :
The resonance of a series RLC circuit occurs when the inductive and capacitive reactances are equal in magnitude but cancel each other because they are 180 degrees apart in phase.
Wattless Current:
The current which consume zero power is called wattless current. Generally, the current in inductor only or capacitor only is known as wattless current.
LLC Oscillation
An Lc oscillation involves the transfer of energy between an inductor (L) and a capacitor (c) in an electrical circuit.
- Charging the capacitor
- Discharging through Inductor
- Inductor charging capacitor
Transformer: It is the device which is used to Step up or step down the input voltage.
Principle: It is based on the principle of mutual inductance (electromagnetic induction).
Uses of Transformer :
- It is used to step down the voltages in various small projects like welding purpose.
- It is used in voltage regulators which are used to regulate the voltage in costly appliances like AC, refrigerators etc.
- In the long distance transmission
Features of Notes
- Students can use Alternating Current notes for last minute revision.
- In the last few days of the exam, students feel very stressed due to the pressure of the exam. Notes will be very helpful for managing the stress in the last days of the exam.
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- Notes are created very carefully so you can rely on this notes.
Summary
| Chapter | Alternating Current |
| Chapter Number | 7 |
| Subject | Physics |
| Class | 12 |
| Medium | English |
FAQ
What is Alternating Current ?
Alternating current (Ac) is an electric current that periodically reverses its direction , and changes its magnitude continuously with time.
What is Power Factor ?
Quality factor :- It is defined as the ratio of potential drop across ‘L’ 0r ‘C’ to the potential drop across ‘R’.
Are these notes sufficient for board exam?
Alternating Current handwritten notes are created by topper’s and expert teacher keeping board exam in mind so you can score maximum in board exam.
Are Alternating Current Handwritten notes according to NCERT latest syllabus?
Yes notes are created according to the NCERT latest syllabus.
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