An electron traversing a resistor in an electric circuit has no more kinetic ene

Question

An electron traversing a resistor in an electric circuit has no more kinetic energy when it exits the resistor than it had when it entered the resistor; however, this electron has lost electrical potential energy. Explain this paradox. What is a resistor? (Explain in terms of microscopic description and energy consideration) Recal1 from thermodynamics that if an object of mass m absorbs an amount of energy Q. Us temperature will increase according to Q = mc(T final - T initial ), where c is the specific heat of the material. A 30g aluminum cup contains l00g of water at 20 degree C. Energy is added to the water at a rate of 2.00 W for 20 minutes. What is the final temperature of the water?

Explanation / Answer

c of water = 4.18 KJ/Kg.K

and mass = 100 gm = 0.1 kg

now heat addded = Q = 2 x 20 x 60 = 2400 J

so, 2400 = m .C.dT

so, 2400 = 0.1 x 4180 x (T - 20)

so final temp = 25.74 C

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