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Ordinarily you will have two variables in your experiment. These are the dependent variable, and the control variable.
For example if you were measuring the fuel consumption in a car at various speeds, then you would vary the speed as your control variable, and measure the fuel consumption as the dependent variable.
In this example, the speed is the easier one for you to vary.
If I wished to determine the light bulb life at various voltages, it would make sense to control the voltage as your control variable, and measure the running time (or maybe the brightness) as a function of the voltage.
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