mA is a measure of _____ that flows from cathode to anode.

Question

Quizplus · Accepted Answer

mA stands for milliamperes, which is a measure of the tube current that flows from cathode to anode in an X-ray tube. Choice A (filament current) refers to the current flowing through the filament to heat it up and cause thermionic emission of electrons, but this current does not flow from cathode to anode. Choice C (space charge) refers to the accumulation of electrons around the cathode due to their negative charge, but it is not a measure of current flow from cathode to anode. Choice D (thermionic emission) refers to the release of electrons from the heated filament, which is necessary for tube current to flow from cathode to anode, but it is not a measure of the current itself.

MA Is a Measure of _____ That Flows from Cathode