A.)For each set of measurements given in the table taken on wires of three different lengths, calculate the resistance of the wires and the corresponding values of the resistivity. What is the average value of the resistivity? Explain how this value compares with the value given in the table below

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.

1. Including uncertainty, calculate the expected resistance of an orange-green-red-gold resistor. 2. A student wires a circuit. When the power supply is switched on, the ammeter reads I = 60 mA and the voltmeter reads V = 4.5 V.a) Use Ohm’s law to calculate the resistance of the resistor being measured.b) What should the student set the voltage to so the current in the resistor is 0.05 A? c) Assuming the resistor has a 10% tolerance, what the color code?

C-Copper wire of length (4) connected in parallel with aluminum wire of length(2) and (10mm) diameter, if the current in each wire is the same. Find the diameter of the copper wire if the resistivity of copper is (0.0159 u-m) & for aluminum is (0.0254 u-m).

A circuit consists of a battery connected to three resistors (70 N, 30 N, and 170 2 ) in parallel. The total current through the resistors is 2.9 A Part A Find the emf of the battery. Express your answer using two significant figures. Πν ΑΣφ E = V Submit Request Answer Part B Find the current through 70 N resistor. Express your answer using two significant figures. ? I = A