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How to choose the connection method of sliding rheostat for measuring resistance by voltammetry?
The most basic connection method: when connecting the sliding rheostat, the effective resistance value of the rheostat should be maximized, so as to protect the circuit. The connection method is the crossing method, that is, upper left and lower right or lower left and upper right. It can't be the same as above, otherwise it can't play the role of sliding rheostat
What is the procedure of measuring resistance by voltammetry? What is the function of sliding rheostat?
ditto
First, connect the power supply, voltmeter, ammeter, switch, sliding rheostat and resistance into a series circuit. The voltmeter is connected in parallel at both ends of the resistance. The sliding slide of sliding rheostat is moved to the maximum resistance. Close the switch and adjust the sliding rheostat so that the voltage at both ends of the small bulb is the rated voltage. Read out the current to indicate the number of books. Then adjust the sliding rheostat, measure other data, measure for many times, take the average value and calculate the resistance
Change the voltage in the circuit
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