A wire is 1.1 m long and 1.2 mm2 in cross-sectional area. It carries a current of 4.8 A when a 2.4 V between its ends. Calculate the conductivity o of the material of which this wire is made.

The density of free electrons in a cylindrical metal wire is 7x10-8 m. The diameter d= 12.23 mm and carrying a current of I- 6.93 A. the drift velocity (in jum/s) of the electrons in the wire must be (charge of electron =1.6x10"19 C)

An aluminum wire having a cross-sectional area equal to 2.00 x 106 m2 carries a current of 3.50 A. The density of aluminum is 2.70 g/cm3. Assume each aluminum atom supplies one conduction electron per atom. Find the drift speed of the electrons in the wire. .00001822 X

An aluminum wire with a diameter of 0.125 mm has a uniform electric field of 0.195 V/m imposed along its entire length. The temperature of the wire is 35.0°C. Assume one free electron per atom. (a) Use the information in this Table of Resistivities and Temperature Coefficients to determine the resistivity (in Ω · m) of aluminum at this temperature. (b) What is the current density (in MA/m2) in the wire? J =-----   MA/m2 (c) What is the total current (in mA) in the wire? I =---------  mA (d) What is the drift speed of the conduction electrons? vd =  ------µm/s (e) What potential difference must exist between the ends of a 1.70 m length of the wire to produce the stated electric field? ΔV = --------- V

A wire is 1.2 m long and 1.2 mm² in cross-sectional area. It carries a current of 5.6 A when a 3.0 V potential difference is applied between its ends. Calculate the conductivity of the material of which this wire is made. Number i 1 Units (Q.m)^-1

A typical lightning bolt may last for 0.197s and transfer 1.19 ✕ 1020 electrons. Calculate the average current (in A) in the lightning bolt.

An 18-gauge copper wire with a diameter of 3-mm carries a constant current of 1.2-A. The charge concentration in the wire is 8.5 x 1028 per cubic meter. Determine the drift velocity in um2/s. Use q = 1.602 x 10-19.

If the current in a wire of a CD player is 4.99 mA, how long would it take for 2.01 C of charge of pass through a cross-section area of this wire?

A particular wire has a resistivity of 3.3 x 10-8 · m and a cross-sectional area of 3.7 x 10-6 m². A length of this wire is to be used as a resistor that will develop 51 W of power when connected across a 20-V battery. What length of wire is required? km

An advanced lab student is studying the effect of temperature on the resistance of a current carrying wire. She applies a voltage to a tungsten wire at a temperature of 59.0°C and notes that it produces a current of 1.40 A. If she then applies the same voltage to the same wire at -88.0°C, what current should she expect (in A)? The temperature coefficient of resistivity for tungsten is 4.50 x 10-3 (°C)-1. (Assume that the reference temperature is 20°C.)