Effect of temperature on battery life
The materials required for this science fair project:
- An air-conditioned room
- 3 Energizer AA size batteries
- 3 Duracell AA size batteries
- 3 Eveready AA size batteries
- 3 AA battery-operated table fans – ensure that they are of the same make and model
- A clock or stopwatch
- An assistant
1. For this experiment, the independent variable is the type of battery and the room temperature. The dependent variable is the time taken for the battery to run out of power. This is determined by checking the time with the clock. The constants (control variables) are the power of the fan motor, the size of the batteries and the humidity in the room.
2. The performance of the batteries will be tested at room temperatures of 18°C, 22°C and 26°C.
3. On the 1st day of testing the room temperature is brought down to 18°C by adjusting the air conditioner. Once the temperature has stabilized, the 3 fans are marked with the battery names, i.e. Energizer, Duracell and Eveready.
4. The 3 fans are powered on and the clock is started. With the help of the assistant, the time taken for the battery power to run low till each of the fans stops, is recorded in the table given below.
5. On the 2nd day, the experiment is repeated by setting the room temperature at 22°C. Once the room temperature had stabilized, the procedure 4 is repeated and the time taken by the fans to stop is recorded in the table below.
6. Finally on the 3rd day of experiment the room temperature is adjusted to 26°C and procedure 4 is repeated again.