When the slide of sliding rheostat moves, the indication of ammeter and voltmeter in the circuit changes

When the slide of sliding rheostat moves, the indication of ammeter and voltmeter in the circuit changes

In the series circuit, first of all, make sure the connection of the sliding rheostat is correct, that is, "one up and one down", and the slide of the sliding rheostat slides to the farthest end (the distance between the slide and the connected lower terminal is the farthest), then the resistance in the access circuit becomes larger, the current becomes smaller, and the current indication becomes smaller. If the voltmeter measures the voltage at both ends of other series resistors, the indication becomes smaller, If the voltage at both ends of the sliding rheostat is measured, the indication will increase. If the power supply voltage is measured, the indication will remain unchanged