I'm ignoring the template because I don't think it's appropiate for the help I want. The problem I'm given: How many electrons per second strike the target in an X-ray tube operating at a current of 50mA? First off, if this is an X-ray tube, where are these electrons coming from, the target? And how why is current for photons measured in amperes? I thought there needed to be charge for there to be current.