




Massachusetts Comprehensive Assessment System
2015, High School Technology/Engineering
Question 23: OpenResponse 

Reporting Category: Electrical and Communication Systems Standard: 5.3  Explain the relationship between voltage, current, and resistance in a simple circuit, using Ohm's law.

A simple circuit is shown below.  Calculate the current in the circuit. Show your calculations and include units in your answer.
A second resistor, R2, with a resistance of 10 Ω, is added to the circuit and placed in series with R1.  Calculate the total resistance in this circuit. Show your calculations and include units in your answer.
 Calculate the current in this circuit. Show your calculations and include units in your answer.
 Describe how adding this second resistor, R2, in series affects the power output of the battery. Explain 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 relationships among voltage, current, resistance, and power in a circuit. The response correctly calculates the current of the simple circuit. The response correctly calculates the resistance and the current in the circuit when a second resistor is added. The response also clearly describes and explains how this affects the power output of the battery. 
4 
3 
The response demonstrates a general understanding of the relationships among voltage, current, resistance, and power in a circuit. 
2 
The response demonstrates a limited understanding of the relationships among voltage, current, resistance, and power in a circuit. 
1 
The response demonstrates a minimal understanding of the relationships among voltage, current, resistance, and power in a circuit. 
0 
The 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 Technology/Engineering
 Question 11: Fluid and Thermal Systems
 Question 23: Electrical and Communication Systems
 Question 33: Engineering Design
 Question 44: Fluid and Thermal Systems
 Question 45: Construction and Manufacturing
Return to the MCAS 2015 Student Work Directory
Last Updated: June 29, 2018


