# Voltage and current while operating a Zener Diode

While operating the Zener diode, even if there is a small change in the input voltage the current through the load resistance remains almost the same. Additionally, the current through the diode changes but the voltage across it essentially remains the same. My question is simple- Why so?

• Can you share the full circuit you're asking about? (i.e. provide a schematic) – The Photon Nov 28 '20 at 5:47
• The answer to the question in your text is "because the zener diode has a very low differential resistance when operating in the zener mode of operation". But you tagged the question with semiconductor-physics which suggests you might actually want to know why it has a low differential resistance...can you edit to clarify? – The Photon Nov 28 '20 at 6:06
• I'm trying to provide an image but it keeps showing that the file size is too large. I'll keep trying, though. – ZMeson Nov 28 '20 at 15:51
• Indeed, I want to know why it has a low differential resistance. – ZMeson Nov 28 '20 at 15:52
• Have you read the WIkipedia article on the zener effect? Is there a particular part you don't understand? – The Photon Nov 28 '20 at 17:12