Songjiang District 20 12 Physics Module 2 15 Question 2 What should I do? It turned out that there was no change at all. How to compare?
When the slider P of the sliding rheostat moves to the right, the ratio of voltmeter V 1 to ammeter A is the resistance value of the sliding rheostat, while the ratio of voltmeter V 1 to ammeter A is the resistance value of the sliding rheostat, which is constant because the resistance of the sliding rheostat is proportional to the length of the resistance wire.