Battery Life Experiment
Teach students about electricity, scientific method, and truth in advertising using the battery life experiment. Children can do this as a class project or even a science fair experiment. To conduct the battery life experiment, you will need three identical flashlights, three different brands of batteries (examples: Duracell, Energizer, and Rayovac), two batteries of each brand, and two test batteries. The brand of the test batteries doesn’t matter. Before you begin the experiment, you need to make sure all three over your flashlight work, so put the test batteries in each flashlight and make sure they turn on and stay on properly. Make a hypothesis on which brand you think will last longest. Once you know the flashlights are functioning properly, label each flashlight Duracell, Energizer, or Rayovac using masking tape or sticking notes. Place the corresponding batteries in the flashlights. Turn the flashlights on all at the same time. Through the day check on the flashlights to see which one turns off first. To record your experiment, write down the time and date of when you turned the flashlights on and the time and date if then each flashlight turned off.
To teach students about the truth in advertising, show the children commercials or print ads for each battery brand. Then compare their experiment results to the company’s advertisements.
When kids learn about plant life, they also learn about transpiration–the passage of watery vapor from a living body (as of a plant) through a membrane or pores, according to Merriam-Webster. The transpiration experiment lets kids see how much water different plants evaporate. Gather a variety of living plants in your classroom. Cover two to three leaves or a small branch of each plant and tightly tape it shut. Be sure to include the same size and number of leaves in each bag. Leave the plants alone for twenty-four hours then collect the water from each bag by pouring it into separate beakers or test tubes. Compare the amount of water evaporate from each plant. Afterwards, make a graph representing the amount of water each plant evaporated.
Children can also conduct this experiment at home or for a science project.