Question: If the voltage rather than the current is kept constant, what happens as the temperature increases from 25°C to 150°C? (a) At first the current

If the voltage rather than the current is kept constant, what happens as the temperature increases from 25°C to 150°C?

(a) At first the current increases, then it decreases.

(b) The current increases.

(d) The current does not change unless the voltage also changes.

The current€“voltage characteristics of a forwardbiased p-n junction diode depend strongly on temperature, as shown in the figure. As a result, diodes can be used as temperature sensors. In actual operation, the voltage is adjusted to keep the current through the diode constant at a specified value, such as 100 mA, and the temperature is determined from a measurement of the voltage at that current.

0.15 0.10 0.05 T = 150° C T = 25° C 0.2 0.4 0.6 0.8 Voltage (V) Current (A)

0.15 0.10 0.05 T = 150 C T = 25 C 0.2 0.4 0.6 0.8 Voltage (V) Current (A)

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