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A student examines the effect of the number of D batteries in a closed circuit on the brightness of a light bulb. In the experiment, four circuits were built with 1, 2, 3, and 4 batteries respectively.
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A student examines the effect of the number of D batteries in a closed circuit on the brightness of a light bulb. In the experiment, four circuits were built with 1, 2, 3, and 4 batteries respectively. For each trial, the brightness of the light bulb was measured using a light meter. Which variable should the student keep constant?

User Ivan Olshansky
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1 Answer

5 votes

Answer: The type of batteries

Explanation: Your testing the brightness of the bulb nothing has anything to do with the batteries

User Slavisa Perisic
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