Answer / kanth

scr is a unidirectional device
and triac is a bi-directional

Answer / akshay ghadge

SCR
1.SCR is a unidirectional device.
2.the gate current can be only positive.
3.SCR can operate in only one quadrent of v-i characteristics.
4.UJT is used for triggering SCR.

TRIAC
1.IS bi-directional device.
2.gate current can be positive or negative.
3.can operate in two quadrants of v-i characteristics.
4.diac is used for triggering triac

Answer / hema

SCR is a 3 layer junction & unidirectional device.
TRIAC is a 3 layer junction & bi-directional device.

Answer / prachi ballal

scr contorls the amount of d.c. power
and triac controls the amount of a.c. power in a load

Answer / lokesh mehta

Scr is 4 layer device nt 3 layer first of all, and it is of 3 junctinal devive and it is unidirectional device whereas, triac is 3 junctional device and is bidirectinal device. This can be checked by wikipedia.

Answer / balamurugan

The antiparallel scr is called thyristor,it cannot be used
in high power application,but the scr can be able to handle
large voltage and current....,thats why in
A.C/D.C,D.C/A.c,transmission line converter have S.C.R.

Answer / m.b.parthasarathy

SCR is an unidirectional device and it allow current in one direction only. There by it is used in DC circuits mainly.

TRIAC is a bi-directional device and it allows current in both direction. Hence it is mainly used in AC circuits only.

Answer / raj kumar

SCR is a Silicon Control Rectifier which contorl dc output
voltage of self this is Main Member OF Transistor
Family.SCR use in AC TO DC Conversion.

Anitpararel Connection of SCR know as TRIAC it use in AC
Power system for controlling.

Answer / akib shaikh

1) In SCR gate current is positive and in Triac gate current is positive or negative.
2) in SCR UJT as triggering device and in triac DIAC is a triggering device.
3) SCR is a unidirectional device and triac is a bidirectional device. 

Answer / m.b.parthasarathy

THE DIFFERENCE IS VERY SIMPLE. SCR can be used in Direct current only.
TRIAC can be used in Alternating current only.

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