Alternating Currrent is one of the easiest and scoring chapter for JEE Mains as well as for JEE Advance.

**Table of Contents**show

## What are the important topics in alternating current class 12?

- AC voltage applied to resistor, capacitor, & inductor.
- Inductive and capacitive reactances.
- RMS values of current & voltage.
- Phasor diagrams.
- LCR series circuit (basics)
- LCR series circuit (resonance)
- Power & power factor in LCR circuits.
- Transformers.

## What is alternating current Class 12 notes?

Alternating Current (AC) It is the current which varies in both magnitude as well as direction alternatively and periodically. I = I0 sin ωt or I = I0 cosωt where, I0 = peak value or maximum value of AC. 2.

## What is Wattless current in AC circuit?

The wattless current is the element of an alternating current that uses no power inside a circuit. This equation describes the average power wasted in an AC circuit. P = V I cos ϕ Where, V – The circuit’s applied voltage.

## What is RMS value of AC current?

Root mean square or R.M.S. value of Alternating current is defined as that value of steady current, which would generate the same amount of heat in a given resistance is given time, as is done by A.C. current , when maintained across the same resistance for the same time.

## Is battery DC or AC?

Batteries provide DC, which is generated from a chemical reaction inside of the battery.

## Is a car battery AC or DC?

Car batteries are direct current (DC) power sources. The main difference between alternating current (AC) and DC is that the power flow in an AC will periodically change, while in a DC power source, the electrical current flows in one direction.

## What is the principle of AC current?

AC generators work on the principle of Faraday’s law of electromagnetic induction, which states that electromotive force – EMF or voltage – is generated in a current-carrying conductor that cuts a uniform magnetic field.

## What is AC signal?

An AC signal is a current, voltage, or numerical sequence that consistently exhibits both positive and negative values, and a DC signal exhibits only positive values or only negative values. The following plots provide examples of AC and DC signals.

## What is amplitude in AC circuit?

The amplitude of an AC waveform is its height as depicted on a graph over time. An amplitude measurement can take the form of peak, peak-to-peak, average, or RMS quantity. Peak amplitude is the height of an AC waveform as measured from the zero mark to the highest positive or lowest negative point on a graph.

## What is the power factor of AC circuit?

Power Factor of an alternating current circuit is the ratio of true power dissipation to the apparent power dissipation in the circuit. The value of the power of an a.c circuit lies between 0 and 1. For a purely inductive or capacitive circuit, it is 0 and for the purely resistive circuit, it is 1.

## Why is AC preferred over DC?

AC can be easily transformed to DC with the help of rectifiers whereas in DC it is not possible. AC can be easily stepped up or stepped down by transformers whereas in DC it is not possible because transformers work on a changing emf principle. Generation of AC is cheaper than DC power.

## What is the weightless current?

The current in an AC circuit is said to be Wattless Current when the average power consumed in such circuit corresponds to Zero. Such current is also called as Idle Current.

## Is Physics removed from NEET 2022?

Hence, it is highly unlikely that Physics would be entirely scrapped. Students shall get more clarity on these two pressing issues once NTA releases the NEET 2022 information brochure.

## Will NEET 2022 be tough?

NEET UG 2022 Exam will be conducted in the month of July, 2022. This exam is one of the difficult exams to crack. Students have to go through previous year papers, the paper patterns and so on. Preparing for NEET UG Exam is months and months of focus, hard work and dedication.

## Is Ncert sufficient for NEET?

No doubt, NCERT must be the go-to source when it comes to NEET as 80-85% of the question paper comprises questions from NCERT sources. However, if one is looking to crack NEET with a good score, reading beyond NCERT is pivotal. Referring to related sources is a must.

## What is peak value of AC?

The peak value of alternating current is √2 times the root mean square value of the alternating current. Formula used: The power dissipated by a current flowing through a resistor is given as follows: P=I2R.

## What is peak factor?

Peak Factor is also known as Crest Factor or Amplitude Factor. It is the ratio between maximum value and RMS value of an alternating wave.

## What is average voltage in AC?

The average voltage (VAV) of a sinusoidal waveform is determined by multiplying the peak voltage value by the constant 0.637, which is two divided by pi (π).

## What is AC frequency?

Alternating current (ac) frequency is the number of cycles per second in an ac sine wave. Frequency is the rate at which current changes direction per second. It is measured in hertz (Hz), an international unit of measure where 1 hertz is equal to 1 cycle per second.

## Why frequency is 50 or 60 Hz?

The use of 50 versus 60 Hz is purely due to historical reasons, with companies in the US making 60 Hz equipment and those in Europe making 50Hz equipment so that they have a monopoly. This rivalry led to the split you see today.

## Why 220V is used in India?

Since India acquired its electricity technology from the British, 220 volts is used.

## Which current is used in battery?

The current obtained from a battery is direct current and it flows from the positive terminal to the negative terminal of the battery through an appliance. Its magnitude and direction remains constant with time.

## How is AC produced?

An alternating current is produced by switching the potential between two terminals in a fixed time interval—the frequency. The difference in potential between the positive and negative terminal is expressed in volts.

## What devices use AC power?

Electronic devices and equipment such as radios, lamps, motors, televisions, and other home appliances directly use AC power for their operation. Meanwhile, DC power is commonly used in consumer electronics.