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20 15 Tongzhou one-mode mathematics answer
20. (1) As can be seen from the figure, when the temperature is 20 CR = 50 Ohms,

Power supply voltage U = IR = 0.2A×(50+10) Ohm = 12V.

(2) The number of ammeters is 0.4A, and the total resistance of the circuit is R'= 12/0.4 = 30 ohms.

So in this semiconductor resistor: R'= 30- 10 = 20 ohms.

The table shows that when the resistance of the semiconductor is 20 ohms, the ambient temperature is 40℃.

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