# Day 79: Circuit Sudoku

Thursday, 12 December 2013

A spontaneous group works on the sudoku circuits.

The kids you see above are working an assignment to simplify circuits. You know, the basic “here’s a mess of resistors in series & parallel, solve for the equivalent resistance.” Here’s the toughest one on the assignment:

Listening in on the conversation, I heard the kids working out a vocabulary to describe their thought process. One exchange:

Stu 1: The V for 1, 2, and 3 are all the same.

Stu 2: Why?

Stu 1: Because 1, 2, and 3 are parallel.

While not always technically accurate, the students were communicating unambiguously. Another exchange:

Stu 3: The A for 4 is the same as 5-6 and the same as total A.

Stu 4: Meaning the A for 4 is 12A and the A for 5 is 4A.

Stu 5: Why?

Stu 3: Because 5 & 6 are in parallel and the current needs to add to 12.

In this mode, most kids called current by its unit abbreviation, A. I opted to not interrupt the flow and good communication to correct them. Would you do the same if you heard kids applying vocabulary mildly incorrectly?

Got this assignment from a coworker and I love it. Students practice solving circuits of parallel and series resistors in a sudoku-like format. Here, go ahead and get the Word version of Circuit Sudoku.

## 5 thoughts on “Day 79: Circuit Sudoku”

1. Amanda Powell

Hi Megan,

I have had this post bookmarked for some time now and we are finally ready to start analyzing circuits in my classes. Unfortunately, it seems the link to your “Circuit Sudoku” handout is broken. Would you mind emailing me a copy?

Thanks!
Amanda
Austin, TX