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# Massachusetts Comprehensive Assessment System

## 2012, High School Technology/Engineering

 Question 45: Open-Response Reporting Category: Electrical and Communication SystemsStandard: 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 WorkSelect 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.

Question 11:
Question 23:
Question 33:
Question 44:
Question 45: