




Massachusetts Comprehensive Assessment System
2013, High School Intro Physics
Question 12: OpenResponse 

Reporting Category: Electromagnetism Standard: 5.2  Develop a qualitative and quantitative understanding of current, voltage, resistance, and the connections among them (Ohm's law).
Standard: 5.3  Analyze simple arrangements of electrical components in both series and parallel circuits. Recognize symbols and understand the functions of common circuit elements (battery, connecting wire, switch, fuse, resistance) in a schematic diagram.

A student performs an experiment to determine the relationships among voltage, current, and resistance. The student’s procedure includes the following steps: Connect a 3.0 V battery to a 42 Ω resistor.
 Measure the current using an ammeter and record the value.
 Replace the 42 Ω resistor with a 54 Ω resistor, and then with a 66 Ω resistor, measuring and recording the current for each resistor.
The table below shows the data collected.  In your Student Answer Booklet, draw a schematic diagram of the student’s original circuit with the 42 Ω resistor. Be sure to label the battery and the resistor.
 Describe in words the relationship between current and resistance as voltage is held constant.
The student will investigate these relationships further using a different experiment. Write a procedure the student could use to test the relationships among voltage, current, and resistance if the only materials available for use are three 3.0 V batteries, one 30 Ω resistor, wire, and an ammeter.
 In your Student Answer Booklet, make a data table similar to the Student’s Data table above to show the expected current measurements for your procedure from part (c). Show your calculations and include units in your answer.

Scoring Guide and Sample Student Work Select a score point in the table below to view the sample student response.
Score  Description 
4 
The response demonstrates a thorough understanding of the connections between resistance, voltage, and current. The response draws a correct schematic diagram and clearly describes in words the relationship between voltage, current, and resistance. The response also includes a correct experimental procedure and data table that shows the expected current measurements for the procedure. 
4 
3 
The response demonstrates a general understanding of the connections between resistance, voltage, and current. 
2 
The response demonstrates a limited understanding of the connections between resistance, voltage, and current. 
1 
The response demonstrates a minimal understanding of the connections between resistance, voltage, and current. 
0 
Response is incorrect or contains some correct work that is irrelevant to the skill or concept being measured. 
Note: There are 2 sample student responses for Score Point 4.
High School Intro Physics
 Question 12: Electromagnetism
 Question 23: Motion and Forces
 Question 32: Motion and Forces
 Question 44: Heat and Heat Transfer
 Question 45: Waves and Radiation
Return to the MCAS 2013 Student Work Directory
Last Updated: June 21, 2013


