Sid wants to compare two different brands of batteries. Which of the following experiments would help sid do this? A. Use one battery brand in a portable radio and the other brand in a remote-control car and compare their performance. B. Use one battery brand to power a handheld fan on a hot day and the other battery brand to power the fan on a cold day. C. Compare how long it takes to recharge a size AA battery from one brand with how long it takes to recharge a size D from the other brand. D. Use each battery brand on the same portable radio and measure how long the batteries last.

Use each battery brand on the same portable radio and measure how long the batteries last.

Explanation:

When comparing things to each other in an experiment, the only difference in the experimental set-up should be the things being compared. In this case, the battery brand is the thing being compared, and so everything but the brand should remain the same.

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