When a current flows in an aluminum wire of diameter 2.33 mm, the drift speed of the conduction electrons is 0.000279 m/s. The conduction electron density in aluminum is 6.00 x 10^28 m^-3. What is the electron current?

A copper wire has a square cross section 2.3mm on a side. The wire is 4m long and carries a current of 3.6 A. The density of the free electrons is n = 8.5 * 1029 m-3. The resistivity of Copper is 1.7 * 10-8 ohmmeter. What is the current density and the electric field inside the wire?

1 %AV |11. V;IV then total charge which crosses the section in time dt is dq = nAevdt. Since current is the rate of flow of charge, it is given as dg nAevdt = nAev dt dt Current density, J == nev ampere/metre Assuming a normal current density J= 1.55 x 10° A/m?, n = 10° for a copper conductor and e =1.6 x 10-19 coulomb, we get 1.55 x 10 = 1029 x 1.6 x 10-19 × v v = 9.7 x 10-5 m/s Example 3: The charge flowing through the imaginary surface in Fig. 7 is 0.16 C every 64 ms. Detemine the current in amperes. Example 4: Determine the time required for 4 x 101 electrons to pass through the imaginary surface in Fig. 7 if the current is 5 mA Example 5: A conductor material has a free-electron density of 1024 electrons per metre', when a voltage is applied, a constant drift velocity of 1.5x10° meter/second is attained by the electrons. If the cross-sectional area of the material is 1 cm?, calculate the magnitude of the current. (Answer: I=0.24 A) Example 6: A copper wire of are 5mm2 has a…

Shown below is a copper wire with the following characteristics: Diameter: 1.45 mm.00145m 1.45 × 10-8 m Number density of electrons: 8.47 x 1028 electrons/m³. Conductivity: 5.96 x 107 S/m a. Calculate the drift velocity (magnitude and direction) of the electrons in the wire when a current of 5.00 A is running through it. b. What direction is the current moving? c. Remembering that current density is a vector, calculate the magnitude and direction of the current density of this wire. d. Calculate the resistivity of the wire. e. Calculate the resistance of this wire if it were 10.0 m in length.