A student is measuring the effects of an electric circuit on a compass, and he is testing to see if increasing the current will cause the compass needle to change its direction faster. He does one trial using a 9-volt battery and another trial using a 1.5-volt battery. He takes accurate data.
Based on good experimental design, what would improve his experiment?
Responses
He should use batteries of the same voltage but from different manufacturers to show he has used different variables.
He should use batteries of the same voltage but from different manufacturers to show he has used different variables.
He should repeat the test with three additional batteries of varying voltages to demonstrate the reproducibility of results.
He should repeat the test with three additional batteries of varying voltages to demonstrate the reproducibility of results.
He should use only one battery but do several trials, using different circuit designs to ensure he has appropriate test groups.
He should use only one battery but do several trials, using different circuit designs to ensure he has appropriate test groups.
He should add a nonworking compass to act as a control.
He should add a nonworking compass to act as a control.
He should use batteries of the same voltage but from different manufacturers to show he has used different variables.
He should repeat the test with three additional batteries of varying voltages to demonstrate the reproducibility of results.
He should use only one battery but do several trials, using different circuit designs to ensure he has appropriate test groups.
He should add a nonworking compass to act as a control.
All of these responses are correct and would improve the student's experiment. By using batteries of the same voltage but from different manufacturers, the student can show that the effects observed are not specific to a particular brand of battery.
By repeating the test with additional batteries of varying voltages, the student can demonstrate that the relationship between current and compass needle direction holds true across different voltage levels.
By doing multiple trials with different circuit designs, the student can ensure that any observed effects are not due to the specific design of one circuit.
And by adding a nonworking compass as a control, the student can compare the behavior of a working compass to that of a compass that should not be affected by the electric circuit, further strengthening their conclusions.
The student can improve his experiment by repeating the test with three additional batteries of varying voltages to demonstrate the reproducibility of results. Additionally, he should use batteries of the same voltage but from different manufacturers to show he has used different variables. He should also use only one battery but do several trials, using different circuit designs to ensure he has appropriate test groups. Furthermore, adding a nonworking compass to act as a control would be beneficial to the experiment.
The option that would improve the experiment is:
He should repeat the test with three additional batteries of varying voltages to demonstrate the reproducibility of results.
By repeating the test with multiple batteries of different voltages, the student can observe if the same trend holds true for different voltage levels. This helps establish the consistency and reliability of the relationship between current and compass needle movement. Additionally, having multiple data points from different batteries increases the robustness of the experiment and strengthens the conclusions drawn.