to the diode.For that, the anode current must be kept well below the hold current.The decreasing rate of the current depends on the circuit inductance.The density of excess carriers will diminish by the recombination. 7)Diac is a bi-directional diode that can be triggered into conduction by reaching a specific voltage value.The diac can pass current in either direction.This is the current-voltage characteristic.A diac has neither an anode, nor a cathode.Its terminals are marked as MT1(main terminal1) and MT2(main terminal2). Triac(bi-directional thyristor) is a three terminal five-layer device capable of conducting current in both directions. It is identified as a three electrode ac semiconductor switch that switches conduction on and off during each alternation.its terminals are:MT1;MT2 and G(gate). 8)Triacs can operate in power modes of 1,5kV and 100A. If Ploss = Pout, the efficiency is approx. equal to: 25% 50% 75% 100%
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