A thermally insulated resistor of 20 ohms has a current of 5 A passed through it for 1 s. It is initially at 20 degrees C.
a) what is the temperature rise?
b) what is the entropy change of the resistor and the universe?
Mass of resistor if 5 g; Cp for the resistor is 0.8x10^3 JKg-1K-1
(Hint: In the actual process, dissipative work is done on the resistor. Imagine a reversible process taking it between the same equilibrium states)