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Power density spectrum of a resistor R can be expressed as ________(a) 2 kTR(b) 1 kTR(c) 0.75 kTR(d) 3 kTRThis question was addressed to me during an online interview.Enquiry is from Problems of DSBSC in chapter Double Sideband Suppressed Carrier Modulation of Analog Communications

Answer»

The correct option is (a) 2 kTR

Explanation: Power Spectral DENSITY is the quantity of power present in a signal in the frequency DOMAIN. The Power Density SPECTRUM of a resistor R can be expressed as 2 kTR where k is Boltzmann’s constant, T is temperature and R is GIVEN RESISTANCE.



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