The only way to close an SCR is with:

Electronics & Communication Engineering :: Basic Electronics Questions and Answers : More Exercises

• Voltage and Current - General Questions
• Parallel Circuits - General Questions
• Capacitors - General Questions
• RLC Circuits and Resonance - General Questions
• Operational Amplifiers - General Questions
• Ohm's Law - General Questions
• Alternating Current and Voltage - General Questions
• RL Circuits - General Questions
• Time Response of Reactive Circuits - General Questions
• Basic Op-Amp Circuits - General Questions
• Measurement, Conversion and Control - General Questions
• Alternating Current vs Direct Current - General Questions
• Bipolar Junction Transistors (BJT) - General Questions
• Thyristors and Tranducers - General Questions
• Number Systems and Codes - General Questions
• Logic Circuit Simplification - General Questions
• Programmable Logic Devices (PLD) - General Questions
• Combinational Logic Circuits - General Questions
• Sequential Logic Circuits - General Questions
• Semiconductor Memory - General Questions
• Computer Hardware and Software - General Questions
• Series Circuits - General Questions
• Series-Parallel Circuits - General Questions
• Inductors - General Questions
• Diodes and Applications - General Questions
• Quantities and Units - General Questions
• Magnetism and Electromagnetism - General Questions
• RC Circuits - General Questions
• Transformers - General Questions
• Transistors and Applications - General Questions
• Special-Purpose Op-Amp Circuits - General Questions
• Resistance and Power - General Questions
• Semiconductor Principles - General Questions
• Field Effect Transistors (FET) - General Questions
• Analog to Digital - General Questions
• Logic Gates - General Questions
• Standard Logic Devices (SLD) - General Questions
• Testing and Troubleshooting - General Questions
• Flip-Flops and Timers - General Questions
• Arithmetic Operations and Circuits - General Questions
• Analog and Digital Converters - General Questions