Physics Electric current and resistance

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Epanhua622
Posts: 1
Joined: Sat Nov 30, 2019 7:18 pm

Physics Electric current and resistance

Post by Epanhua622 » Sat Nov 30, 2019 7:23 pm

Can someone tell me how to begin this problem. Or what to do :!: :!: :!:

You build a wire by combining an 8 inches copper wire with a 10 inches nichrome wire. If their combine resistance is 10 kΩ, find the cross section area of both wires. The nichrome wire has twice the area of the copper wire.

ztruwk
Posts: 23
Joined: Fri Oct 25, 2019 3:20 pm

Re: Physics Electric current and resistance

Post by ztruwk » Sun Dec 01, 2019 4:10 pm

Two relevant facts:

1) Resistance = (resistivity * length)/(cross sectional area)
2) For series resistors, Rtot = R1 + R2

resistivities: google them
length: given
relationship between areas: given
Rtot: given

Only one thing to solve for!



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