




Massachusetts Comprehensive Assessment System
2012, High School Technology/Engineering
Question 45: OpenResponse 

Reporting Category: Electrical and Communication Systems Standard: 5.1  Explain how to measure and calculate voltage, current, resistance, and power consumption in a series circuit and in a parallel circuit. Identify the instruments used to measure voltage, current, power consumption, and resistance.

A diagram for a simple circuit is shown below. Suppose a second resistor (R2), with a resistance of 7.0 Ω, is added to the circuit in series. Draw the diagram for the series circuit with the two resistors. Label the components of the new circuit.
 Calculate the total amount of current in the new circuit. Show your calculations and include units in your answer.
 Calculate the potential difference (voltage) across each resistor, R1 and R2, in the new circuit. 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 how to determine voltage and current in a series circuit. The response includes the diagram for the circuit and correctly calculates the total current and the potential difference across each resistor. 
4 
3 
The response demonstrates a general understanding of how to determine voltage and current in a series circuit. 
2 
The response demonstrates a limited understanding of how to determine voltage and current in a series circuit. 
1 
The response demonstrates a minimal understanding of how to determine voltage and current in a series 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: Engineering Design
 Question 23: Electrical and Communication Systems
 Question 33: Fluid and Thermal Systems
 Question 44: Construction and Manufacturing
 Question 45: Electrical and Communication Systems
Return to the MCAS 2012 Student Work Directory
Last Updated: September 20, 2012


