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EXPERIMENT 2 D`ARSONVAL GALVANOMETER
EXPERIMENT 2 D`ARSONVAL GALVANOMETER

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... inductive static Var compensator. The proposed configuration is constructed of a traditional TCR shunted by a parallel resonance circuit and the parallel combination is connected in series to a series resonance circuit. The parallel and series resonance circuits are tuned at the power system fundame ...
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... using a servo extension cable, follow these steps: 1. When plugging the cable onto the PING))) sensor, connect Black to GND, Red to 5 V, and White to SIG. 2. Check to see if your Board of Education servo ports have a jumper, as shown at right. 3. If your Board of Education servo ports have a jumper, ...
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... with banana plug connections on their ends. The rotating dial may have regions marked V, A, Ω, (and perhaps others) for measuring voltage, current, and resistance. A DMM can be used as an ohmmeter–a device for measuring resistance. In this part of the exercise, you will use it measure the resistance ...
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... delay set by capacitor C4 elapses. The EV kit provides a simple timer circuit comprised of U2, R7, and C5 to pull the EN pin low before the time-out delay. Once PG asserts as open-drain, R7 begins to charge C5 to the output voltage (OUT). When C5 charges to 2/3 x OUT, U2 pulls the EN pin low. The EV ...
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TRIAC



TRIAC, from triode for alternating current, is a genericized tradename for an electronic component that can conduct current in either direction when it is triggered (turned on), and is formally called a bidirectional triode thyristor or bilateral triode thyristor.TRIACs are a subset of thyristors and are closely related to silicon controlled rectifiers (SCR). However, unlike SCRs, which are unidirectional devices (that is, they can conduct current only in one direction), TRIACs are bidirectional and so allow current in either direction. Another difference from SCRs is that TRIAC current can be enabled by either a positive or negative current applied to its gate electrode, whereas SCRs can be triggered only by positive current into the gate. To create a triggering current, a positive or negative voltage has to be applied to the gate with respect to the MT1 terminal (otherwise known as A1).Once triggered, the device continues to conduct until the current drops below a certain threshold called the holding current.The bidirectionality makes TRIACs very convenient switches for alternating-current (AC) circuits, also allowing them to control very large power flows with milliampere-scale gate currents. In addition, applying a trigger pulse at a controlled phase angle in an AC cycle allows control of the percentage of current that flows through the TRIAC to the load (phase control), which is commonly used, for example, in controlling the speed of low-power induction motors, in dimming lamps, and in controlling AC heating resistors.
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