Question

a student is experimenting with an electric circuit. he can measure the number of batteries, the number of lamps, the brightness of the lamp(s), and the length of the connecting wires. if he wants to investigate how the number of lamps affects the brightness of the lamp(s), what independent, dependent, and control variables should he use? independent variable: dependent variable: control variables:

Explanation:

The independent variable is what is changed in an experiment. Here, it's the number of lamps being varied to see its effect. The dependent variable is what is measured as a result of the change in the independent variable, so the brightness of the lamps is the dependent variable. Control variables are kept constant to ensure only the independent variable affects the dependent variable. So, the number of batteries and length of connecting wires should be kept constant.

Answer:

Independent Variable: Number of lamps
Dependent Variable: Brightness of the lamps
Control Variables: Number of batteries, length of connecting wires