Which circuit determines the energy of electrons accelerated toward the x-ray target?

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Multiple Choice

Which circuit determines the energy of electrons accelerated toward the x-ray target?

The energy that the electrons gain as they are accelerated toward the target comes from the electric potential difference across the tube, so the high-voltage circuit sets their energy. The electron kinetic energy is essentially e times the tube voltage, meaning at 70 kV the electrons reach about 70 keV. The filament circuit only heats the filament to produce electrons (affecting how many electrons are emitted), not how much energy they have. The autotransformer and the step-down transformer help regulate voltages for filament heating and for enabling the desired tube voltage, but the energy of the accelerated electrons is determined by the high-voltage circuit.

The energy that the electrons gain as they are accelerated toward the target comes from the electric potential difference across the tube, so the high-voltage circuit sets their energy. The electron kinetic energy is essentially e times the tube voltage, meaning at 70 kV the electrons reach about 70 keV. The filament circuit only heats the filament to produce electrons (affecting how many electrons are emitted), not how much energy they have. The autotransformer and the step-down transformer help regulate voltages for filament heating and for enabling the desired tube voltage, but the energy of the accelerated electrons is determined by the high-voltage circuit.

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