How to solve the problem that the circuit is changed from series connection to parallel connection, and the indication change of ammeter and voltmeter after moving the sliding rheostat in the circuit? It's better to have a problem-solving routine, The quantity is there, but because I don't understand it very well, the more I do it, the more confused I am.

How to solve the problem that the circuit is changed from series connection to parallel connection, and the indication change of ammeter and voltmeter after moving the sliding rheostat in the circuit? It's better to have a problem-solving routine, The quantity is there, but because I don't understand it very well, the more I do it, the more confused I am.

In series circuit: moving slide, if the resistance of sliding rheostat becomes larger, the voltmeter connected in parallel at both ends of it becomes larger, the voltmeter connected in parallel at both ends of other resistors or small lamps becomes smaller, and the ammeter becomes smaller