Reflection: Checks for Understanding Household Circuits - Section 4: Closing Quiz on Circuits


When it is time to review the quiz, Socrative has a nice feature that allows me to download a MS-Excel report, Circuit Summary - Data, that shows how all students scored on individual questions. I use these results to assess student understanding on circuits and in the next lesson use Small Group Instruction to help struggling students. I can also download and print individual student quiz results and give them to students for their own review.

For this quiz, I noticed four problems where more than 25% of the class answered it wrong. Those questions are below along with how I will adjust to this information. 

2. What is defined as the potential difference between two points on a circuit?

This is a simple definition question, however, over 40% of the class chose the wrong answer for this, so it is clear to me that we should revisit definitions as a class. 

3. What is Ohm's Law?

The problem here is algebra. Many students chose the V=IR answer but failed to recognize that the other answers are the same, just solved for different quantities. I will review this idea with the students who missed it.

7. A circuit has to much current flowing through it and the voltage is fixed. What can be done to reduce the current?

This is a bad question that should be changed or elliminated. The answer of "add a resistor" is correct only for series circuits. In a parallel circuit, one would want to remove a resistor to reduce the current. I will award all students +1 point for this bad question and change it for future classes.

11. In a parallel circuit the total resistance is

This is a basic rule of parallel circuits and students should know this. I will pull aside the few who got this wrong for some small group instruction. 

  Checks for Understanding: Student Understanding
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Household Circuits

Unit 4: Electrostatics and Circuits
Lesson 12 of 16

Objective: Students provide evidence for which type of circuit (parallel or series), is found in the wiring of their house.

Big Idea: In a series circuit, the current remains constant and voltage-drops add together and in a parallel circuit the current adds and voltage-drops are constant.

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