In Hypothesis 1, the voltage was intentionally manipulated as the independent variable.
In Hypothesis 2, the resistance was intentionally manipulated as the independent variable and the dependent variable measured in both cases was the current.
In an experiment, the independent variable is a manipulated variable. Due to the fact that you may alter it, it is termed the “manipulated” one. In other words, you can choose in advance whether to raise it or lower it. Only one variable should be being changed at a time throughout an experiment.
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