Omar wrote a hypothesis about batteries called dry cells.If more dry cells are connected end to end, a light bulb will work longer because there is more energy available.What are the variables in his hypothesis?
Answer
A
The independent variable is the number of dry cells, and the dependent variable is the length of time the bulb works.
B
The independent variable is the length of time the bulb works, and the dependent variable is the number of dry cells.
C
The independent variable is the number of dry cells, and the dependent variable is the amount of energy available.
D
The independent variable is the amount of energy available, and the dependent variable is the number of dry cells.
Explanation
The independent variable is what Omar changes: the number of dry cells connected end to end. The dependent variable is what he measures as a result: how long the bulb works. Therefore, the correct choice is A, the number of dry cells and the length of time the bulb works.
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