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Additional resources for Introduction to Electronic Emission, Tubes, and Power Supplies
Remember E = I × R? De Forest wanted a voltage change, not a current change. The answer was simple: In other words, run the plate current variation (caused by the voltage on the grid) through a resistor, and cause a varying voltage drop across the resistor. This is shown in figure 1-16. —Operation of the plate load resistor. The circuit is identical to the one in figure 1-15 except that now a resistor (called a plate-load resistor, RL) has been added to the plate circuit, and a voltmeter has been added to measure the voltage drop across RL.
Because current is the same in all parts of a series circuit, we know that the same current must flow across the space between filament and plate. We know now that the electrons boiled from the heated filament are NEGATIVE and are attracted to the POSITIVE plate because UNLIKE CHARGES ATTRACT. Diode Operation with a Negative Plate Fleming’s next step was to use a similar circuit but to reverse the plate battery. The circuit is shown in figure 1-4. —Diode with a negative plate. With the plate NEGATIVE relative to the filament, the filament hot, and the circuit completed as shown, the ammeter indicated that ZERO current was flowing in the plate circuit.
We have called them filament and plate. More formally, they are called CATHODE and PLATE, respectively. Sometimes the filament is called a HEATER, for obvious reasons-more on this later. Within a few years after the discovery of the Edison effect, scientists had learned a great deal more than Edison knew at the time of his discovery. J. Thomson in England had discovered the electron. Marconi, in Italy and England, had demonstrated the wireless, which was to become the radio. The theoretical knowledge of the nature of electricity and things electrical was increasing at a rapid rate.