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Q: How is a TRIAC equivalent to two anti-parallel SCRs?
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Where does a SCR differ from a power transistor in operation?

thyristor can be scr or triac scr is strictly dc a triac is back to back scr's with a common gate two scr's back to back can be gated independently scrs cost less than triacs an scr can be combined with a full wave bridge to make an equivalent to a triac but this gives an additional 1.5V forward voltage drop


What is an antiparallel?

An antiparallel is a line which forms equal angles with two other lines but in opposite directions.


State two advantages of a triac as compared to an SCR?

triac act as a ac contactor


What is a gateless triac?

A gateless triac is a diac. It is often used in the gate circuit of a triac to balance out the firing voltage for the triac in both quadrants, so that there is no DC offset in the controlled load. This is because, while the gate trigger voltage is often asymmetric in the two quadrants, the M1/M2 breakdown voltage is often symmetric.


What does antiparallel mean?

Antiparallel refers to a configuration where two molecules or structures run in opposite directions. In terms of DNA, antiparallel describes the orientation of the two strands running in opposite 5' to 3' directions. This allows for complementary base pairing to occur between the strands.


Is DNA antiparallel?

Yes, DNA is antiparallel. This means that the two strands of the DNA double helix run in opposite directions, with one strand running 5' to 3' and the other running 3' to 5'. This antiparallel arrangement allows for complementary base pairing between the strands.


What is an antiparallel force?

Antiparallel forces are forces that act in opposite directions along the same line of action. This means that the forces are equal in magnitude but opposite in direction. In a free-body diagram, antiparallel forces are typically represented using arrows pointing in opposite directions along a straight line.


Contrast the scr and the triac?

Essentially an Scr is a solid state switch that will only allow current to flow in one direction. A triac is essentially two scr's in Anti- parallel that allows current to pass in both directions.


Can you use Diac and Triac for dc supply?

The diac conducts in both directions at approximately the same voltage, making it unsuitable in an AC to DC supply. The triac also conducts in both directions, based on a gate voltage which is slightly different in the two usable quadrants. That is why the diac is often used to trigger the triac - it makes the two conduction cycles more symmetric. In both cases, the diac/triac does not make sense for an AC to DC supply, but it works well in an AC voltage regulator, such as a lamp dimmer or motor speed controller.


Are Single stranded DNA molecules are said to be antiparallel when they lined up next to each other but oriented in opposite directions?

No, single stranded DNA molecules aren't considered antiparallel. Antiparallel refers to the orientation of the two strands in a double-stranded DNA molecule, where one runs 5' to 3' and the other runs 3' to 5'. Single-stranded DNA is usually unidirectional and doesn't have a complementary strand to be antiparallel to.


Why we don't use triac in case of ac controlled rectfier rather than scr?

A TRIAC does not have a symmetrical turn-on point in the opposite quadrant. This will introduce a DC bias, which you probably don't want. You can use an SCR, and then add diodes to allow it to operate in the opposite quadrant, or you can use two SCR's. Alternatively, you can use a DIAC in the TRIAC's gate circuit to balance the turn on point.


What direction must two chains of DNA run?

Two chains of DNA run in opposite directions, or antiparallel to each other. This means that one strand runs in the 5' to 3' direction, while the other runs in the 3' to 5' direction. This antiparallel orientation is important for DNA replication and other cellular processes.