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On the HacDC mailing list, we’ve been having a discussion about Wolfram|Alpha and some of the amazing things it can do (and some of the controversy already surrounding it). Here ‘s the return on a query for resistor values.


Gareth Branwyn

Gareth Branwyn is a freelancer writer and the former Editorial Director of Maker Media. He is the author or editor of a dozen books on technology, DIY, and geek culture, including the first book about the web (Mosaic Quick Tour) and the Absolute Beginner’s Guide to Building Robots. He is currently working on a best-of collection of his writing, called Borg Like Me.



  1. Gonzalo says:

    If you’re a yubnub user you could also find useful the command resistor. As:

    resistor 4k7 -tol 5

    It takes you to

    It also gives you the nearest standard resistor value.

  2. Jack says:

    There does seem to be a bit of controversy, but I am still eager to try it out.

  3. jaron says:

    Whoa, whoa, whoa…. major terms of service violation here.

  4. Frank says:

    It’s strange how it can find a resistor given the colours, but how do you go the other way?

    I’ve tried “25k”, “25k resistor”, “25k resistor colours” but it can’t work it out. I guess the wolfram programmers haven’t added this kind of query yet.

    1. Delfairen says:

      You would need to search for 25k ohm resistor etc

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