S تر A bronze alloy has a resistivity of 13 x 10-6 2 cm. A piece is cut in the shape of a cuboid (right- angled box shape), 13 mm thick by 15 mm wide by 30 mm long. a) Calculate the resistance R and the conductance G of the cuboid measured over its length. b) Calculate the resistance R and the conductance G of the cuboid measured across its width. 2 2

A copper (resistivity = 1.72 EXP-8 Ω.m) conductor with a square cross section, 1.0 mm on a side is 100 m long and is initially 20oC. 1. If the temperature coefficient (a) of copper is 0.00393 per degree Celsius, what is the change in resistance of the copper conductor if the temperature is increased to 100 degrees Celsius? 2. What is the resistance of this conductor?

2. 1.70 mm cylindrical rod of diameter 0.550 cm is connected to a power supply that maintains a constant potential difference of 16.0 V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0-C) the ammeter reads 18.8 A, while at 92.0°C it reads 17.2 A. You can ignore any thermal expansion of the rod. a) Find the resistivity for the material of the rod at 20.0.C. b) Find the temperature coefficient of resistivity at 20.0-C for the material of the rod. c) The ammeter should be parallel or series connected to the wire?

Nichrome alloy has a resistivity of 110 × 10-6 Ωcm. From a roll of nichrome wire of 2.5 mm diameter, a length 1 m long is taken.i) Calculate the resistance R and the conductance G of the piece of wire.ii) A second piece also 1 m long is connected in parallel to the first. Calculate the resistance and conductance of the pair.

1) A resistor has a value of 20 ohms (Ω) when it is at 15 degrees Celsius. If the coefficient of thermal resistivity is 3.5 x 10-3/ Celsius, determine the value of the resistance at 97 degrees Celsius. Write your result to 3 significant figures. 2) A certain copper wire has a resistance of 10.0 ohm (Ω).  a) At what point should the wire be cut so that the resistance of one segment is 4 times the resistance of the other segment? b) What is the resistance of each segment?

A wire has a length of 8.0 m and is made of copper which has a resistivity of 1.7 x 10-8 Ωm.  This wire has a diameter of .01 m.  What is the resistance of this wire?

a) Determine the length (in mm) of a gold conductor that has a resistance of 0.018 Ω and a cross-sectional area of 3.4 x 10-9 m2.  The resistivity of gold is 2.2 x 10-8 Ω-m [round your final answer to one decimal place].  b) An aluminum conductor with the same length and area as in the question above would have a higher resistance than the gold conductor.  The resistivity of aluminum is 2.6 x 10-8 Ω-m. True or False?

A metallic conductor has a resistivity of 18 ´ 10-6 W×m. What is the resistance of a piece that is 30 m long and has a uniform cross sectional area of 3.0 mm2?

Resistivity of silver is less than that of tungsten. If a tungsten wire and a silver wire are having the same length and area of cross section, which of the following statements is true? Oa. Resistance of the tungsten wire is more than that of the silver wire O b. Resistance of the tungsten wire is less than that of the silver wire Oc Both wires are having the same resistance O d. From the given information, a conclusion cannot be made

Question A2 Pure copper has a resistivity of 1.68 x 10-8 Nm. Some accurate cubes of copper are prepared, and electrical measurements are made, for which current is passed across a pair of opposite faces. a) Comparing a 2.5 cm cube and a 5 cm cube, which will have the higher conductance? Ex- plain your answer. b) Given eight 1 cm cubes, how can they be stacked to get the highest and the lowest resis- tance between opposite faces of the stack? Calculate the resistance of each stack.