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# Massachusetts Comprehensive Assessment System

## 2013, High School Intro Physics

 Question 12: Open-Response Reporting Category: ElectromagnetismStandard: 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 WorkSelect a score point in the table below to view the sample student response.

ScoreDescription
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.

Question 12:
Question 23:
Question 32:
Question 44:
Question 45: