English: If a voltage source sets the unheated isolated electrode in Edison's experimental bulb to a higher voltage than the heated filament, electrons will be attracted and flow along the arrows from the filament to the electrode, demonstrating the Edison effect, measured by Ⓐ.
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Uploaded a work by User:Omegatron from https://commons.wikimedia.org/wiki/File:EdisonEffect.svg which I've rearranged to be side-by-side with UploadWizard