PLEASE GIVE ANSWER ALONG WITH WORK! NO ANSWER= NO RATING THANK YOU! A wire of Gl

Question

PLEASE GIVE ANSWER ALONG WITH WORK! NO ANSWER= NO RATING THANK YOU!

A wire of Glameter 0. 650 mm and length 50. 0 m has a measured resistance of 2. 60 Ohm. What is the resistivity of the wire? Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. Ohm m Platinum and silver wires of equal length are found to have the same resistance. What Is the ratio of their radll? r Pt/r Ag = At what temperature will silver have a resistivity that is three times the resistivity of iron at room temperature? degree C If electrical energy costs 12 cents, or $0. 12, per kilowatt-hour, then what would the following events cost? burning a 80 W light bulb for 24 h straight $ operating an electric oven for 7. 0 h If It carries a current of 20. 0 A at 220 V $

Explanation / Answer

Q3 resistivity = R * A / l = 6.9 * 10-8

Q4 Resistance = Resistivity * l / A

As resistance and length are equal and A is proportional to r^2, ratio of radii =

rpt/rag = Resistivityag / Resistivitypt = 0.145

Q6. Power consumed by bulb = 80/1000 * 24 Kw/hr = 1.92 KW/h

Cost = 1.92 * 24 = 46.08 cent

P = VI = 220 * 20 W = 4400 W or 4.4 KW

Cost = 4.4 * 7hrs * 24 = 739.2 cents

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