Notice: Payments for answers will end 4/10/2017. Click for more info.
Question and answer
Q: Difference between triac and diac
A: This question has not been answered. Can you answer it? Please add your answer below ...
Question
Asked 8/23/2009 10:17:07 AM
Updated 8/23/2009 4:53:36 PM
2 Answers/Comments
Get an answer
New answers
Rating

There are no new answers.

Comments
The DIAC is a trigger diode that conducts current only after its breakdown voltage has been exceeded momentarily. When this occurs, the resistance of the diode abruptly decreases, leading to a sharp decrease in the voltage drop across the diode and, usually, a sharp increase in current flow through the diode. The diode remains "in conduction" until the current flow through it drops below a value characteristic for the device, called the holding current. Below this value, the diode switches back to its high-resistance (non-conducting) state.

A TRIAC is an electronic component approximately equivalent to two silicon-controlled rectifiers (SCRs/thyristors) joined in inverse parallel (paralleled but with the polarity reversed) and with their gates connected together. This results in a bidirectional electronic switch which can conduct current in either direction when it is triggered and thus doesn't have any polarity. It can be triggered by either a positive or a negative voltage being applied to its gate electrode. Once triggered, the device continues to conduct until the current through it drops below a certain threshold value, the holding current, such as at the end of a half-cycle of alternating current (AC) mains power.
Added 8/23/2009 10:52:54 AM
Thank you for using Weegy. Ask us anything 24/7! Be sure to tell all your friends.
Added 8/23/2009 4:53:36 PM
Add an answer or comment
Log in or sign up first.
Questions asked by the same visitor
SCR
Weegy: do you have a question for me? I don't know what SCR means. User: Difference between triac (More)
Question
Expert Answered
Updated 8/23/2009 4:54:28 PM
2 Answers/Comments
A silicon-controlled rectifier (or semiconductor-controlled rectifier) is a four-layer solid state device that controls current. The name "silicon controlled rectifier" or SCR is General Electric's trade name for a type of thyristor. The SCR is controlled by a logic gate signal.
Added 8/23/2009 10:59:31 AM
Thank you for using Weegy. Ask us anything 24/7! Be sure to tell all your friends.
Added 8/23/2009 4:54:28 PM
26,107,395 questions answered
Weegy Stuff
S
P
Points 114 [Total 765] Ratings 0 Comments 114 Invitations 0 Offline
S
P
P
L
P
P
Points 54 [Total 1722] Ratings 0 Comments 54 Invitations 0 Offline
S
Points 21 [Total 21] Ratings 2 Comments 1 Invitations 0 Offline
S
Points 20 [Total 20] Ratings 2 Comments 0 Invitations 0 Offline
S
Points 3 [Total 14] Ratings 0 Comments 3 Invitations 0 Offline
S
Points 2 [Total 2] Ratings 0 Comments 2 Invitations 0 Offline
S
Points 2 [Total 2] Ratings 0 Comments 2 Invitations 0 Offline
S
Points 2 [Total 2] Ratings 0 Comments 2 Invitations 0 Offline
S
Points 1 [Total 1] Ratings 0 Comments 1 Invitations 0 Offline
S
Points 1 [Total 1] Ratings 0 Comments 1 Invitations 0 Offline
* Excludes moderators and previous
winners (Include)
Home | Contact | Blog | About | Terms | Privacy | © Purple Inc.