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The value of the thermal voltage at room temperature can be approximated as

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The value of the thermal voltage at room temperature can be approximated as

(a) 25 mV

(b) 30 mV

(c) 35 mV

(d) 40 mV

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This is a very interesting question from BJTs Current-Voltage Characteristics topic in portion Bipolar Junction Triodes (BJTs) of Electronic Devices & Circuits

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Correct answer is (a) 25 mV

Explanation: Thermal voltage is given by kT/q which at T = 25 degrees Celsius is approximately 25 mV.

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