(20 1 1? Nanping) In order to explore the factors related to the work done by current, Xiaojun designed a device similar to A according to the thermal effect of current. He put two resistance values.

(1) In the experiment, the work done by the current is reflected by observing the inflation degree of the balloon.

(2) Device A can explore the relationship between current work and resistance.

(3) Comparing two different experimental devices, A and B, the better device is B, because the thermometer can accurately measure the temperature change of kerosene, which is convenient for quantitative research.

So the answer is: (1) expansion, (2) resistance, (3) b; Thermometer can accurately measure the temperature change of kerosene, which is convenient for quantitative research.

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