Alternating current vs direct current

Actually, 

Main difference is alternating current changes direction

While direct current is always in one direction

So you can see from graph that direction of ac changing.... 

So there is a question comes in mind why direction of ac is change???????? 

🤔

So we have to understand how ac is generated... 

Actually if we have a coil And we change magnetic flux through coil by moving it or rotating it there is an emf is induced 

This was observed by Faraday 

Because of which current is induced in coil 

This current is in that direction opposite to the change that has induced it it called lenz law.. 

Suppose you rotate a coil in magnetic field

Lets see rotation

Till this point you see magnetic flux incrasing so acc. To lenz law

Current is in that direction that decrease the magnetic field 

I mean anticlockwise you can think see the digram anticlockwise current produce upward magnetic field that opposes existing magnetic field that's actually lenz law... 

After half rotation 👀see the image

Notice flux start decreasing so current is in that direction which increase the flux

I mean clockwise current

So notice when we start rotating the loop till half turn current is in anticlockwise

After half turn flux starts decreasing so current flows in clockwise to increase the flux

So that's why we get sinosudal curve for our ac because after every half turn it changes it's direction.

So it's actually lenz law which tell us that direction of current induced is opposite to the change that has produced it....... 

And lenz law actually based on law of energy conservation

Ac is produced by ac generator. . . We will talk about it later... 

Thnks for reading📖📖📖