Question

What is a control setup!​

Answer 1

A control set-up is often needed to ensure that the experiment is valid & accurate. It serves as a baseline for the comparison of the results of the main experiment.

Answer 2

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• When an experiment is carried out, it's important that only one variable is tested so that any changes observed can't be attributed to another factor.

A control set-up "controls" for other factors. Ideally it's the exact same set-up as the experiment except for one difference - the variable being tested.