(2) According to the experimental data in the table, draw corresponding points in the coordinate system, and then make an image, as shown in the figure.
(3) According to the R-t image of thermistor, the resistance of thermistor decreases with the increase of temperature.
(4) According to the R-t image, when the temperature is 15℃, the resistance of the thermistor is 40Ω, and the internal resistance of the ammeter is Rg = UI-R = 8v0.01-400 = 400Ω.
When the circuit current is 14mA=0.0 14A, the thermistor resistance value r = UI-rg = 80.014-400 ≈171ω, and the display temperature is 34℃.
(5)A, thermal bimetal sensor and reed switch are equivalent to switches in the circuit, which can control the on-off of the circuit, so A is correct;
B, the main component of the electronic scale is the pressure sensor, and the electronic scale converts force into voltage, so B is correct;
C, photoelectric mouse device and fire alarm application is photosensitive sensor, so c is correct;
D, microphone is a commonly used acoustic sensor, its function is to convert acoustic signals into electrical signals, so D is wrong; So choose ABC ..
So the answer is: (1) Ohm returns to zero; (2) As shown in the figure; (3) The resistance of thermistor decreases with the increase of temperature; (4)34℃; (5) Activity-based costing.