(1) When the slider P of the sliding rheostat moves to the right, the resistance value of the connected circuit increases, the total resistance value r of the circuit increases, and the power supply voltage u remains unchanged.

From I=UR, it can be seen that the circuit current becomes smaller and the indication of ammeter A becomes smaller;

(2) the ratio of voltmeter V 1 to voltmeter V2 UV1uv2 = IR1ir2 = r1r2, because when the slider p of the sliding rheostat moves to the right.

The resistance R 1 remains unchanged, and the resistance R2 becomes larger, so the ratio becomes smaller.

So the answer is: smaller; Get smaller.