Question

На участке цепи последовательно соединены металлический и полупроводниковый резисторы. Считая напряжение на участке постоянным, определить, как изменится сила тока при нагревании резистора металлического, полупроводникового.

Answer 1

1. Когда металл нагревается его сопротивление увеличивается,соответсвенно,если считать напряжение постоянным,то сила тока уменшиться. 
2. А когда полупроводник нагревается то его сопротивление уменьшается,соответсвенно,сила тока увеличиться. 

Answer 2

Understanding the Circuit Setup

When a metallic and a semiconductor resistor are connected in series in a circuit, and the voltage across the circuit is kept constant, the change in current due to the heating of the resistors can be determined.

Effect of Heating on Metallic Resistor

When a metallic resistor heats up, its resistance typically increases. This increase in resistance leads to a decrease in the current flowing through it.

The relationship between resistance and temperature for metallic conductors is given by the formula: R = R₀(1 + αΔT), where R is the resistance at temperature T, R₀ is the resistance at a reference temperature, α is the temperature coefficient of resistance, and ΔT is the change in temperature.

Effect of Heating on Semiconductor Resistor

In the case of a semiconductor resistor, the change in resistance due to heating can be more complex. Semiconductors generally exhibit a decrease in resistance with an increase in temperature, unlike metallic conductors.

The relationship between resistance and temperature for semiconductors is given by a more complex formula, which involves factors such as the bandgap energy and the density of charge carriers.

Conclusion

In summary, when a metallic and a semiconductor resistor are connected in series and the voltage across the circuit is kept constant, the heating of the resistors will lead to changes in their resistances, which in turn will cause changes in the current flowing through them. The metallic resistor's resistance typically increases with heating, leading to a decrease in current, while the semiconductor resistor's resistance may decrease, leading to an increase in current.

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