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Question
a student lab group is brainstorming the design of an experiment that uses an ammeter (measures current) and different resistors to determine the effect of the resistance of a resistor upon the current in a simple circuit. which post-it note describes the most effective design? choice 1 of 4: • put a 10.0-ohm resistor in a circuit with a single d-cell. measure the current in the circuit. • add a second d-cell and measure the current with two d-cells. • repeat trials for three, four, and five d-cells, being careful to get accurate current measurements for a fixed amount of resistance in each trial.
The goal is to determine the effect of resistance on current. The first choice changes the voltage (number of D - cells) while keeping resistance fixed, which is testing the effect of voltage on current, not resistance. A proper experiment to test the effect of resistance on current should keep voltage constant and vary resistance. Since the question's options are not fully provided, but based on the given first option, it's not the correct design as it manipulates voltage (independent variable wrong for the research question). However, if we assume the other options (not shown) would involve keeping voltage constant and changing resistance, the given choice is incorrect. But since the user might expect analysis of the given choice: this design investigates how current changes with voltage (number of D - cells) for a fixed resistance, not resistance on current. So it's not the most effective for the stated goal.
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The provided Post - it note (Choice 1) does not describe the most effective design. To determine the effect of resistance on current, the voltage should be kept constant (e.g., use a fixed number of D - cells) and the resistance of the resistor should be varied (use different resistors like 5.0 - ohm, 10.0 - ohm, 15.0 - ohm etc.). The given design varies the voltage (number of D - cells) while keeping resistance fixed, so it is investigating the effect of voltage on current, not resistance on current.