All of us can't live without electricity, because nowadays electricity and appliances which run on electricity are important parts of our day-to-day life, but have you ever wondered, how this is possible ? Electricity generated 100miles or even 1000 miles away is used by you to run your computers or charge your smartphone. Interesting right?

Well, these unbelievable things are only possible because of current and to be precise in terms of physics "

**Alternating Current".**

### What is an alternating current ?Â

As you know a current is created when charge flows inside a conductor but what about alternating current ?Alternating current is something whose magnitude changes continuously with time and direction of this current gets reversed periodically.

The alternating current changing magnitude with time and direction periodically. |

We have given all the info and notes about these two in our notes

### Measurement of AC:

So to measure of AC, if you think logically then there are two ways to measure alternating current:**Measuring the component of the current.**

*1. Component measurement:*P.s: Component measurement is practically not possible because when we talk about component of electric current it also includes measuring the amount of charge passing in current which is practically not possible to find out. So, therefore, it's a theoretical method and practically not possible.

**Measuring the effect created by AC.**

*2. Effect measurement:*So this method is actually possible because we can measure the effect created due to current and by measuring this we can find what amount or measure of AC current can do to such extent of the effect.

So, therefore, the definition of effect measurement in the terminology of physics would be:

*The magnitude of alternating current is the value of steady current which does the same work during time period of one cycle.Â*Steady current is type of current that does not change its magnitude or direction with time and is constant throughout the time.

I know, it's a bit confusing so let me clear this for you, suppose a steady current does some work amount 'X' in the time period taken by alternating current to complete one cycle. So the magnitude of steady and alternating current will be the same.

## Important Topics:

Important topics fromÂ**Â for boards areÂ**

*Alternating currents*

*L.C.R circuits, Induced EMF, Power Factor, Transformer, AC Circuits and RMS Current.***ForÂ**

**Â for class 12 boards, conceptual questions from these topics as well as**

*1 marker and MCQ**can be asked.*

**Phasor and LCR circuits diagram relatedÂ**questions**Â**All these topics are provided in the notes given below, they are highly in-depthÂ

**Â so refer to them, it's more than enough for boards.**

*class 12 physics notes of Alternating current*## Handwritten notes:

This article is a brief summary of chapter 7, Alternating Current forÂ**. These notes haveÂ**

*all the derivation related to this chapter and other important things. I have prepared my special handwritten notes*

*all the derivation of this chapter and important topics for your board exam :)*SoÂ

**do read these notes if you are a class 12th student and preparing for your board exam**. These notes are easy to understand. To download themÂ

**.**

*CLICK HERE*
## 6 Comments

its so perfect.. thank uh for helping :)

ReplyDeleteWelcome, we are always here to help. You can check notes of other chapters as well if you want to.

Deletehow can i download it

ReplyDeleteYou can download it directly from embedded PDF or drive link give in the article.

Deletehow can i check other notes

ReplyDeleteYou can either search on google typing " (Chapter name) + notes + student baba" or you can either directly search chapter name on our website using search icon in top menu.

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