In a Controlled Experiment,the Researcher Typically Manipulates One Variable,called the Independent

question 16

Multiple Choice

In a controlled experiment,the researcher typically manipulates one variable,called the independent variable,to determine how this variable affects the final outcome,called the dependent variable.In the following hypothetical example,a researcher applies varying amounts of fertilizer (0,2,4,8,10 units) to potted tomato plants.All other variables that may affect the outcome (watering,temperature,sunlight,plant size,etc.) are kept the same from pot to pot.At the end of the growing season,the tomatoes grown on each plant are weighed to determine which fertilizer level produces the largest tomato yield.Which variable was the independent variable and which was the dependent variable?

• A)Independent = Fertilizer amount,Dependent = Temperature
• B)Independent = Temperature,Dependent = Yield
• C)Independent = Fertilizer amount,Dependent = Yield
• D)Independent = Yield,Dependent = Fertilizer amount

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Definitions:

Conductors

Materials that allow the flow of electric current through them, often used in electrical wiring and components.

Insulators

Materials or objects that do not easily conduct electricity, used to prevent unwanted flow of current.

Electromotive Force

The energy supplied per charge by a source of electrical energy, such as a battery or generator, measured in volts.

Volts

The unit of measurement for electric potential difference or electromotive force, central to understanding electric circuits.