(1) According to the characteristics of thermistor, when the temperature in the thermistor area decreases, the resistance increases, and according to Ohm's law, the current in the circuit decreases.

(2) When the temperature near the thermistor changes from 20℃ to 25℃, the resistance of the thermistor decreases and the current in the circuit increases, so the scale of 25℃ should be on the right side of 20℃.

Therefore, the answer is: (1) small; (2) Right.