please label answers An iron wire has resistivity po, cross-sectional area Aq an

Question

please label answers

An iron wire has resistivity po, cross-sectional area Aq and length I4)- What is the resistance of this wire? There are nine wires identical to the one in (16). If these wires are connected in series, what is their equivalent resistance? There are 6 wires identical to the one in (16). If these wires are connected in parallel, what is their equivalent resistance? You have an iron wire of lengt h L. If this wire has the same resistance as the system of wires from (17), what is the cross-sectional area of this iron wire?

Explanation / Answer

16)

R = pL/A

17)

R = 9pL/A

18)

R = pL/9A

19)

9pL/A = pL'/A'

A' = L'A/9L

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