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Across 4. Acts like a relay but has no moving parts. 6. Used in an Voltage generator to convert A/C into D/C. 9. Made of exactly 4 electrons in it's outer ring 11. The point wherea P & N type material are bonded together. 13. Allows current to flow only in one direction untill voltage reaches a specific point. then voltage and current can flow in a reverse direction. 14. Number of pulses per second.

Down 1. Voltage operates on a variable voltage value. 2. A diode that produces light when forward biased. 3. A square wave of fixed frequency but variable duty cycle. 4. A variable resistor that reacts to temperature. 5. The part of the transistor that has an arrow on it. 7. Small amounts of impurities added to a semiconductor. 8. A one way check valve for electricity 10. Diodes that turn on or off when subjected to light. 12. The control part of the transistor.