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Massachusetts Comprehensive Assessment System

2012, High School Technology/Engineering

  Question 45: Open-Response  
A diagram for a simple circuit is shown below.
A simple circuit shows a 9 V battery and a 5 Ohm resistor.  Ohms law is shown below: I=V/R.
Suppose a second resistor (R2), with a resistance of 7.0 Ω, is added to the circuit in series.
  1. Draw the diagram for the series circuit with the two resistors. Label the components of the new circuit.
  2. Calculate the total amount of current in the new circuit. Show your calculations and include units in your answer.
  3. 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.

ScoreDescription
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: June 24, 2016
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