Aluminum, copper, gold, and nichrome wires of equal lengths of 1.0  10-1 meter and equal cross-sectional areas of 2.5  10-6 meter2 are at 20.0°C. Which wire has the greatest electrical resistance?

A new material is found to be superconducting below 77 K. How much resistance will a 75 mm long sample of this material have if it is at a temperature of 69.3 K while connected to a 6.4 V AC-power supply? R =       How much thermal energy will it generate?Thermal energy generated =

A certain metal has a temperature coefficient of resistivity of 0.0064 (°C) -1. A wire made from that material is connected to a source of constant voltage via a switch. At the instant the switch is closed, the temperature of the wire is 27 °C, and the initial power dissipated in the wire is Po. At what wire temperature has the power dissipated in the wire decreased to (1/2)Po? Number Units

The resistance of a certain power line is 1500 at 20°C. Find the line resistance when the sun heats up the line to 42°C (T-236°C and x=0.00391)

A wire 3.00 m long and 0.450 mm2 in cross-sectional area has a resistance of 39.5 Q at 20.0°C. If its resistance increases to 40.2 Q at 28.5°C, what is the temperature coefficient of resistivity? (°C)-1

A metal wire of cross-sectional area 2.00x10-6 m² and length 4.0 m has a current of 25.0 A uniformly distributed across that area. If the conductivity of the metal is, 5.9x107 (.m)-!, calculate the magnitude of the electric field, in V/m, along the wire?

Question 20 A 8 A.h lithium-ion cell is charged at 2C (units of C-rate are h¹) from 0% state of charge to 67% state of charge. The cell has a constant internal resistance of 0.01 Q and reversible (entropic heating) is assumed to be negligible. How much heat energy is generated. In the lithium-ion cell as a by-product of this charge process? Give your answer as a positive value in joules (), to the nearest integer.

The resistance of a wire increases by 22 percent when the temperature of the wire is increased from 10 degrees C to 105 degrees C. What is the temperature coefficent (a) of the wire's material?

A teapot with a surface area 9 325 cm2 is to be plated with silver. It is attached to the negative electrode & an electrolytic cell containing Silver nitrate (Ag+ NO3-). The cell is Powered by a 12.0- resistance battery and has a 의 son If the density & silver is 1.05 x 104 kg/m³, Over what time Interval does a 0-133-mm Jayer of Silver build up on the teapot?!! 의

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