Q. 3

When a current passes through a resistor, its temperature

increases. Is it an adiabatic process?

Answer :

We know that adiabatic process occurs without the transfer of heat or mass of substances between a thermodynamic system and its surroundings.


Now, in this case, No.


There is no exchange of heat with surrounding in case of adiabatic process.


In case of resistance,


Heat is developed by the virtue of Joule heating effect in the capacitor, which state that the heat developed in the resistance is given by


H =i2 RT


Where,


I is the current in the circuit


R is the resistacne of thetemperature


T is the time perod for which current is allowed to transfer in the circuit.


The heat developed by the resistor led to increase in the operating temperature of the resistor due to which the resistance of the resistor increase with the increase of the resistance given by the formua below:



Where,


R= resistance at some temperature T


R0 = resistance at zero temperature


and = Temperature co-efficient.


Thus, the heat generated is exchanged between the resistor and surrounding.


Thus, the above process cannot be an adiabatic process.


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