Paper Circuits

I’ve been teaching a semester long electronics class every semester since I started teaching in 2000. It started as a basic circuits course, but several years ago I started teaching it with the Arduino micro-controller platform. It has undergone several transformations over the years and I’m changing it yet again this semester.

We’re starting with some basic circuit fundamentals. In the past I assumed they would learn these fundamentals as we worked with Arduino. It turns out I was wrong. One of the circuit building things we did this week involved making paper circuits. This worked out really well and gave students a chance to discover differences between series and parallel circuits. They also got to do some trouble shooting to figure out closed, open, and short circuits.

All in all it was a fun project to help set the tone for the semester while also giving us an activity we can refer back to as we move forward.

Parallel Paper Circuit

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Conductivity Meter for Chemistry Class

We have a new chemistry teacher this year. At his old school he used these conductivity meters from Flinn Scientific. He said they work really well. He had students use them to make qualitative comparisons of the conductivity of different solutions. The only problem I saw was their price tag. They are $22 ea. This is not horrible, but there really isn’t much to them. So I decided to see if I could make them cheaper.

Turns out it was pretty easy to source the components to place the cost at no more than $1.50 ea. So, for the price of one of Flinn’s meters I can make a classroom set.

I created a set of instructions for making your own:  Conductivity Meter Tutorial (PDF)

I used Plasq’s ComicLife to create this. I’d forgotten how much I enjoy using this for making tutorials.