Guide

Main Module | Energy from Mud? Thank a Microbe!
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Scientic Investigations
ScieNtific iNveStiGatioNS
Activity 2: Maximizing Power Output in a MudWatt
TEACHERS: In this investigation students manipulate variables to determine cause
and effect between the variables with the goal of optimizing the amount of power
output from the MudWatt™.
Two MudWatts™ per group are used to conduct an experiment using a control.
Students select one independent variable (of their own choosing) to change in one
MudWatt™ while keeping the second MudWatt™ unchanged to serve as the control.
Students may also select the dependent variable to measure and record.
Using their selection of independent and dependent variables students develop
a testable question for their investigations. Students may design their own
investigations using Activity2 or the ExperimentDesignTemplate, depending on
their previous experience with experimental design. Students are evaluated using
the experimental and group work rubrics provided at the end of these investigations.
Objectives
Inthislesson,students
will:
• Gain familiarity with
how MFCs respond to
different conditions
• Conduct a controlled
experiment while
manipulating variables
• Make accurate
observations and
record data
• Use indirect evidence
to make predictions
• Practice analyzing
data results
• Evaluate data for
a cause and effect
relationship
Vocabulary
Control: part of an experiment in which the
scientist does not manipulate the variable
Independent variables: the variable that is
manipulated or changed on purpose, or
Dependentvariables: the variable that responds
or what results or is measured
Testablequestion: a question that can be
answered through scientic investigations
ScienceasInquiryPractices
5 Asking questions (for science)
5 Developing and using models
5 Planning and carrying out investigations
5 Analyzing and interpreting data
5 Using computer technology, and computational
thinking
5 Constructing explanations (for science)
5 Engaging in argument from evidence
5 Obtaining, evaluating, and communicating
information
activity 2