In the experiment of studying the relationship between current and voltage, resistance, when studying the relationship between current and resistance () A. Adjust the sliding rheostat to keep the current in the circuit unchanged B. adjust the sliding rheostat to keep the voltage at both ends of different fixed resistance R unchanged C. make the voltage at both ends of resistance R change in multiple D. make the current in the circuit change in multiple in each measurement

In the experiment of studying the relationship between current and voltage, resistance, when studying the relationship between current and resistance () A. Adjust the sliding rheostat to keep the current in the circuit unchanged B. adjust the sliding rheostat to keep the voltage at both ends of different fixed resistance R unchanged C. make the voltage at both ends of resistance R change in multiple D. make the current in the circuit change in multiple in each measurement

To explore the relationship between current and resistance, the control variable method is applied in the experiment. After changing the resistance each time, the slide of sliding rheostat should be adjusted to keep the voltage at both ends of the resistance unchanged. In this experiment, as long as the voltage at both ends of the resistance remains unchanged, the current does not need to change in multiple; so ACD is wrong, B is correct; so B is selected