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Whenever you measure resistance, the resistance itself cannot be negative!
When an SCR (Semiconductor Controlled Rectifier) is not conducting, it has a high resistance between its anode and its cathode. When its gate is triggered and the SCR is conducting, it has a low resistance between its anode and its cathode.
For more information about SCRs, see the answer to the Related Question (for which a link is shown below) and also the Related Link.
Wiki User
∙ 11y ago
Anshuman Johari
Yes SCR do show a negative resistance region, but it is only a trace and it is an uncontrollable region where we can't find the Q point hence we do not have a region of operation there so the region is of no use. that is the only reason why SCR is a passive element.
Anonymous
Yes SCR do show a negative resistance region, but it is only a trace and it is an uncontrollable region where we can't find the Q point hence we do not have a region of operation there so the region is of no use. that is the only reason why SCR is a passive element.
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An SCR conducts appreciable current when Anode and gate are both negative?
No, an SCR conducts when the anode and gate are both positive.
What is the calculation for changing the firing angle in scr-?
The calculations for changing the firing angle in SCR is K = 1 [π − α + 1 sin(2α )]
Why does the resistance of a thermistor decrease as the temperature rises?
Some materials have negative temperature coefficients of resistance, and some have positive temperature coefficients. Carbon is an example of a substance with a negative thermal coefficient of resistance, so it's resistance will decrease as it gets hotter.
What is the basic function of the SCR's gate electrode?
The SCR's gate electrode is used to turn the SCR on, i.e. fire it.
What is the effect of holding current in SCR?
The effect of holding current (anode to cathode) in an SCR is to retain the turned on state, even in the absence of any gate voltage. When used as an AC voltage controller, the SCR conducts from the moment the gate and anode goes positive until the anode goes negative on the next zero line crossing, irrespective of any further transistions on the gate.
What happens when negative pulse applied to scr?
It turns off. Once the SCR is turned on (fired) it stays on until the voltage across it goes to zero. One way to do that is to hit it with a negative pulse. You need to be careful about how large that negative pulse is, though, as you could destroy the SCR.
An SCR conducts appreciable current when Anode and gate are both negative?
No, an SCR conducts when the anode and gate are both positive.
What is the calculation for changing the firing angle in scr-?
The calculations for changing the firing angle in SCR is K = 1 [π − α + 1 sin(2α )]
What is negative resistance region?
The region where resistance decreases with increase in temperature.
Why does the resistance of a thermistor decrease as the temperature rises?
Some materials have negative temperature coefficients of resistance, and some have positive temperature coefficients. Carbon is an example of a substance with a negative thermal coefficient of resistance, so it's resistance will decrease as it gets hotter.
Why SCR is not called GCR?
because it is gcr not scr
What is the basic function of the SCR's gate electrode?
The SCR's gate electrode is used to turn the SCR on, i.e. fire it.
What is the effect of holding current in SCR?
The effect of holding current (anode to cathode) in an SCR is to retain the turned on state, even in the absence of any gate voltage. When used as an AC voltage controller, the SCR conducts from the moment the gate and anode goes positive until the anode goes negative on the next zero line crossing, irrespective of any further transistions on the gate.
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
How can an SCR be made to conduct?
An SCR has three legs. The anode, cathode, and gate. The control voltage sent to the gate will allow the SCR to conduct.
How ujt exhibits negative resistance characteristics?
dcdcdwcewecwe
What is the difference between positive and negative temperature coefficient of resistance?
Negative temperature coefficient of resistance means that as the temperature of a piece of wire or a strip of semiconducting material increases, the electrical resistance of that material decreases.
