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It consists of a vacuum Q3. The vacuum diode works mostly like a modern diode. container with cathode and anode inside as shown in Fig.1. This cathode and anode are separated with distance d and connected across a voltage source Vo. It works on the principle of thermionic emission. A filament heats this cathode. Hence electrons get emitted from the cathode and attracted towards the anode forming convection current J. If the positive voltage applied at the anode, is not sufficient enough, the anode cannot attract the electrons emitted from the cathode due to hot filament. As a result, one cloud of electrons gets accumulated in the space between cathode and anode. This is called space charge. Due to this space charge, the further emitted electrons get repealed and come back to the cathode. Hence virtually electron emission stops. No current flows through the circuit. Find the relation between J and Vo.(25m)

It consists of a vacuum Q3. The vacuum diode works mostly like a modern diode. container with cathode and anode inside as shown in Fig.1. This cathode and anode are separated with distance d and connected across a voltage source Vo. It works on the principle of thermionic emission. A filament heats this cathode. Hence electrons get emitted from the cathode and attracted towards the anode forming convection current J. If the positive voltage applied at the anode, is not sufficient enough, the anode cannot attract the electrons emitted from the cathode due to hot filament. As a result, one cloud of electrons gets accumulated in the space between cathode and anode. This is called space charge. Due to this space charge, the further emitted electrons get repealed and come back to the cathode. Hence virtually electron emission stops. No current flows through the circuit. Find the relation between J and Vo.(25m)

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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It consists of a vacuum Q3. The vacuum diode works mostly like a modern diode. container with cathode and anode inside as shown in Fig.1. This cathode and anode are separated with distance d and connected across a voltage source Vo. It works on the principle of thermionic emission. A filament heats this cathode. Hence electrons get emitted from the cathode and attracted towards the anode forming convection current J. If the positive voltage applied at the anode, is not sufficient enough, the anode cannot attract the electrons emitted from the cathode due to hot filament. As a result, one cloud of electrons gets accumulated in the space between cathode and anode. This is called space charge. Due to this space charge, the further emitted electrons get repealed and come back to the cathode. Hence virtually electron emission stops. No current flows through the circuit. Find the relation between J and Vo.(25m)
Transcribed Image Text:It consists of a vacuum Q3. The vacuum diode works mostly like a modern diode. container with cathode and anode inside as shown in Fig.1. This cathode and anode are separated with distance d and connected across a voltage source Vo. It works on the principle of thermionic emission. A filament heats this cathode. Hence electrons get emitted from the cathode and attracted towards the anode forming convection current J. If the positive voltage applied at the anode, is not sufficient enough, the anode cannot attract the electrons emitted from the cathode due to hot filament. As a result, one cloud of electrons gets accumulated in the space between cathode and anode. This is called space charge. Due to this space charge, the further emitted electrons get repealed and come back to the cathode. Hence virtually electron emission stops. No current flows through the circuit. Find the relation between J and Vo.(25m)
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