21. When the temperature increases, the inter-base resistance (RBB) of a UJT ___________.
22. Power electronics essentially deals with control of a.c. power at ___________.
23. A DIAC is ___________ switch.
24. A diac is simply ___________.
25. A triac has ___________ semiconductor layers.
26. A diac has ___________ semiconductor layers
27. When a UJT is turned ON, the resistance between emitter terminal and lower base terminal ___________
28. The triac is ___________.
29. A triac is equivalent to two SCRs ___________.
30. An SCR is a . . . . . . . . triggered device
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