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MHT-CET : Physics Entrance Exam

MHT - CET : Physics - Thermionic Emission Glossary

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                     Thermionic Emission: The emission of electrons from the surface of a metal when the metal is heated to a high temperature.

                     Thermions: The electrons emitted by the surface of a metal when it is heated to a high temperature.

                     Vacuum Diode: The simplest electronic vacuum tube which contains two electrodes: an anode and a cathode; enclosed in an evacuated glass enclosure.

                      

                     Triode: An electronic vacuum tube with three electrodes: an anode, a grid and a cathode.

                      

                     Space Charge: When the plate potential is not sufficient to attract all the electrons emitted by the cathode, they gather around the cathode and form a cloud. The cloud of negatively charged electrons form a space charge.

                     Saturation Current: When the plate potential of a vacuum tube is sufficient to attract all the electrons as fast as they are emitted by the cathode, the current in the device is said to be saturation current. The space charge now completely disappears.

                     Rectifier: A device which converts an ac signal to a dc signal.

                     Half Wave Rectifier: A device containing one diode which produces output for only the positive half cycle of the input ac cycle and blocks the negative half cycle.

                     Full Wave Rectifier: A device containing two diodes, which produces output (two positive half cycles) for each positive and negative half ac cycle of the input signal.

                     An Amplifier: A device which magnifies a weak ac signal without distorting its shape.

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