Relays vs. Triacs

And the reason these items cannot be looked up in a textbook is what, please?

reason No 1 : I don't know the spelling to check it is realy or really ?

No 2: Why should I check the text book when there are answers available from others

No 3: This is a question asked in the class assignment.

No 4 : In Text books there is no discussion abot difference between Triac and really or realy or even relay, there were some talks about SCR but i don't know they are really or triac or what are they ?

And a few more.

how lazy can one get. Just type 'Relay" in the internet and hit the serch button and I am sure you will get all the information you want. It so easy.

http://en.wikipedia.org/wiki/Main_Page

Let the learning begin.

This type of question really scares me.

Here we are again with someone who obviously knows NOTHING about the two devices in question. Has no clue as to their application, use or operation, not to mention the possible safety implications of misuse or misapplication.

Is he using 24v or 240v?

Could just be a general enquiry from someone new to the field of electronics (although how thy found CR4 before finding a basic guide on the internet is beyond me).

This type of question really scares me.

These types of questions don't scare me, it's the questions asked by clueless people performing actual design work or electrical installation such as.......

"have site with 20MVA transformer, how do I wire it up and what cables do I use. What is the rating of bus bar and how do I calculate short circuit current. What is difference between star and delta and which one should I use".

hi i think you are a never work in electrical so you cant to differentation between relay or traic .....please write your mail