Sample Variables & Hypothesis

Question

Which AA battery maintains its voltage for the longest period of time in low, medium, and high current drain devices?

Variables

Independent Variable: Time, how long each battery operates.

Dependent Variable: Voltage.

Experimental Group	Controlled Variables for Each Group
Low current drain	Same portable CD player Play the same music track Play at the same volume level
Medium current drain	Identical flashlight Identical light bulb
High current drain	Same camera flash
All groups	Battery size (AA) Constant temperature (A battery works better at a warm temperature.)

Hypothesis

Hypothesis: As I test for increasingly long periods of time, the Energizer AA battery will maintain a higher voltage than other batteries.