A copper wire of diameter 0-16 cm is connected in series to an aluminium wire of diameter 0-25 cm. A current of 10 ampere is passed through them. Find (a) current density in copper wire. (b) drift velocity of electron in the aluminium wire. The number of free electrons per unit volume of aluminium wire is 1029 -3. m

A copper wire of diameter 0-16 cm is connected in series to an aluminium wire of diameter 0-25 cm. A current of 10 ampere is passed through them. Find (a) current density in copper wire. (b) drift velocity of electron in the aluminium wire. The number of free electrons per unit volume of aluminium wire is 1029 -3. m

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter9: Current And Resistance

Section: Chapter Questions

Problem 81CP: A 10-gauge copper wire has a cross-sectional area A=5.26mm2 and carries a current of I=5.00A . The...

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A metal object having a length (10m), cross section area (0.5 mm2), and resistance (0.5N) is connected to a potential difference source of 5V at room temperature. If the density of free electrons equals (8×1025 electron/m³), Calculate the current through the object.
A 220. V potential difference is applied to a space heater that dissipates 440. W during operation.(a) What is resistance during operation?(b) At what rate do electrons flow through any cross-section of the heater element? (c) The space heater has a resistance of 27.5 Ω at 25.0 °C and the temperature coefficient of resistivity is α = 4.50x10^-3 °C^-1. What is the temperature of the space heater internal elements?