3 Days Timetable: Alternating Currents

 Table of contents Meet Your Timetable Goals with EduRev! Day 1: Resonance, L.R. Circuit, and Series L-R, C-R & C-R Circuit Day 2: Alternating Current: Average & RMS Value, and Series AC Circuit Day 3: Power in an AC Circuit and Transformers Revision

Let's explore the Physics chapter called "Alternating Currents" and understand its importance for the JEE exam. Based on past years' JEE questions from 2016 to 2023, it's evident that this chapter holds significant weight in the exam. Mastering the concepts in this chapter is crucial for success in the JEE exam.

## Meet Your Timetable Goals with EduRev!

The study plan for this chapter offers you a schedule to manage your time effectively for learning and practicing the chapter thoroughly. By following this plan diligently, you'll be well-prepared to tackle even the most challenging questions related to each topic in the JEE exam. EduRev simplifies your preparation by providing comprehensive resources for each topic, including chapter notes, videos, and tests. To access these valuable resources, including documents, videos, and tests, simply click here.

### Topics to Cover

Before diving into the study plan, let's list the topics we'll cover in this chapter:

### Study Plan

For this study plan, we'll adopt a 3-day strategy based on the number of topics, with one extra day dedicated to revision. Let's ensure we cover all the topics mentioned above under the chapter.

## Day 1: Resonance, L.R. Circuit, and Series L-R, C-R & C-R Circuit

Study Tip: Create summary notes for Resonance and circuit concepts to aid in quick revision.

## Day 2: Alternating Current: Average & RMS Value, and Series AC Circuit

Study Tip: Understand the significance of Average & RMS Value in alternating current.

## Day 3: Power in an AC Circuit and Transformers

Study Tip: Create a visual representation or diagram to understand the working of Transformers.

## Revision

• Revisit all the topics you've covered in the last three days.
• Test yourself by solving questions from HC Verma, DC Pandey, and Irodov.

In the JEE Physics exam, you'll encounter questions similar to the ones mentioned above. Solving these questions is the best way to review and improve your understanding of the topics. If you find a question challenging, it's a sign that you might need to revisit the topic and solve more related questions.

Note: It's important to manage your time efficiently across all your subjects. EduRev offers timetables for all your other subjects, allowing you to plan your study schedule for all subjects, not just one.

Certainly, here are all the hyperlinks categorized at the end of the study plan:

Resources:

Feel free to use these links to access the resources you need for your JEE Physics preparation.

The document 3 Days Timetable: Alternating Currents | Physics for JEE Main & Advanced is a part of the JEE Course Physics for JEE Main & Advanced.
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## Physics for JEE Main & Advanced

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## FAQs on 3 Days Timetable: Alternating Currents - Physics for JEE Main & Advanced

 1. What is resonance in an L.R. circuit?
Resonance in an L.R. circuit occurs when the inductive reactance (XL) and the capacitive reactance (XC) cancel each other out, resulting in a purely resistive circuit. This happens when the angular frequency of the applied AC voltage matches the natural angular frequency of the circuit. At resonance, the current in the circuit reaches its maximum value, and the impedance of the circuit is minimum.
 2. How does a series L-R circuit behave in an AC circuit?
In a series L-R circuit, the inductor (L) and resistor (R) are connected in series with an AC voltage source. The inductor opposes the changes in current, leading to a phase shift between the current and voltage. The resistor limits the flow of current. As a result, the voltage across the resistor and inductor are out of phase with each other. The impedance of the circuit is given by Z = √(R^2 + (XL - XR)^2), where XL is the inductive reactance and XR is the resistive reactance. The circuit behaves as a low pass filter, allowing low-frequency components to pass through and attenuating high-frequency components.
 3. What is the average and RMS value in an AC circuit?
The average value of an AC voltage or current waveform is the arithmetic mean of all the instantaneous values over one complete cycle. It is zero for symmetrical AC waveforms. The RMS (Root Mean Square) value of an AC voltage or current is the square root of the average of the squares of all the instantaneous values over one complete cycle. It is a measure of the effective value of the waveform and is used to calculate power in AC circuits.
 4. How does power vary in an AC circuit?
In an AC circuit, the power is given by the product of the voltage and current. However, due to the phase difference between voltage and current, the power may vary. For resistive loads, where the voltage and current are in phase, the power is constant and given by P = Vrms * Irms, where Vrms is the RMS value of voltage and Irms is the RMS value of current. For reactive loads, where the voltage and current are out of phase, the power may be positive or negative. The power factor (cos θ) determines the ratio of real power (P) to apparent power (S), where S = Vrms * Irms. The power factor can be lagging (inductive load) or leading (capacitive load).
 5. What is the role of transformers in AC circuits?
Transformers are devices used to transfer electrical energy from one circuit to another through electromagnetic induction. In AC circuits, transformers are used to step up or step down the voltage levels. A step-up transformer increases the voltage level, while a step-down transformer decreases the voltage level. This transformation is achieved by having a primary coil and a secondary coil wound around a common iron core. The ratio of the number of turns in the primary coil to the number of turns in the secondary coil determines the voltage transformation ratio. Transformers are essential in power transmission and distribution systems, allowing efficient long-distance transmission and voltage regulation.

## Physics for JEE Main & Advanced

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