# Science Reasoning Center - Circuits

There were three Electric Circuits passages in the Legacy version that targeted students' science reasoning abilities. They have each been converted to a Version 2 activity. We have included the links below:

Bulb A versus Bulb B
This passage describes a collection of simple and related experiments involving a comparison of two different types of light bulbs. Diagrams, tables and short descriptions are used to describe the results of investigating the brightness of the bulbs when configured in circuits in various ways, the appearance of their filaments under a microscope, and a comparison of flow rates through the filaments to air flow rates through straws. Questions target a student's ability to understand an experimental design, to make inferences based on experimental results from similar studies, to draw conclusions that are consistent with provided data, to identify models that are supported by two or more data presentations, and to identify an assumption associated with a conclusion.

Wire Gauge and Characteristics
This passage describes the American Wire Gauge system (AWG) for expressing the width of electrical wires. Two tables are used to describe the relationship between wire gauge, wire diameter, cross-sectional area, resistance, and ampacity at specific temperatures. Questions target a student's ability to select data from a table, to identify the manner in which one variable depends upon another, to interpolate and to extrapolate from data within a table, to recognize complex numerical patterns in tables of data, and to combine information from two different tables to draw complex conclusions.

Series and Parallel Circuits
This passages describes three simple experiments in which the characteristics of series and parallel circuits are compared and contrasted. Figures and written descriptions of observations are provided to describe how the arrangement of light bulbs affects the bulb brightness. Questions target a student's ability to understand an experimental design, to draw conclusions that are consistent with provided data, to make appropriate inferences based on observations, to identify simple relationships between variables, and to identify the experimental conditions that would lead to specific results.