3 ms·
Some bit of my head is a zero ohm resistor resistor. Every time I read 'zero ohm resistor', it goes 'nope nope nope' at me.
by starbeast 8y ago
Some bit of my head is a zero ohm resistor resistor. Every time I read 'zero ohm resistor', it goes 'nope nope nope' at me.
- analognoise 8y agoWhy not? They're great as test points and you can pull them off and place a resistor or capacitor in their place.
- Mindless2112 8y agoProbably because the operating temperature is about 0 Kelvin.
- starbeast 8y agoI guess it doesn't have to go quite that low, depending on what you make it out of. Though you have got me wondering whether anyone has put a crumb of high temp superconductor in a smd resistor package yet and if so, for what purpose.
- gh02t 8y ago"High temperature" is relative, they still have to be cryogenically cooled to temperatures around -100C. So no SMD superconductors yet.
- starbeast 8y agoThat is still a relatively accessible temperature, given that liquid nitrogen is about the same price as clean water. Off the top of my head, I could think of one use, which would be to trigger a transistor to switch on and off some high power superconducting circuit when the small bit of superconductor gets cold enough to start superconducting.
- wolfgang42 8y agoI assume it's the paradox of a resistor that doesn't resist.
- blt 8y agoThink of it as an "epsilon ohm resistor".
- starbeast 8y agoHeh, I like that. I tend to think of them as a surface mount jumper.
- cellularmitosis 8y agoMy 1/4W THT zero ohm resistors are about 0.025 ohms according to my bench meter. In theory, that implies a 400 amp rating... not going to try that anytime soon :)
- amyjess 8y agoIt's zero in the number of significant figures used by the test equipment.
- amelius 8y agoThat's a pity because then you can't use that resistor to measure current by a measurement of a voltage difference.
- ssfrr 8y agoThey make high-precision low-resistance resistors specifically for current measurement. Your standard cheapo zero-ohm resistor though is more for creating optional connections that you can configure at assembly time.