Question

If the resistance of a certain copper wire is 1 ohm then the resistance of similar nichrome wire will be about?

Answer 1

The equation of resistance,

R=ρ(l/a)

where,

R = resistance,

ρ = resistivity,  

l = length  

a =cross-sectional area.

suppose for Copper wire, R and ρ=(1.68E-8 (ohm m)) be resistance and resistivity  

Similarly, for Nichrome wire let R’ and ρ’ =(130E-8 (ohm m)) be resistance and resistivity.

because the two wires are identical their length to cross sectional area is same. From given data for Copper wire, R=1 ohm. Then,

l/a=R/ρ = 1/(1.68E-8) / meter.

Using the above result for the Nichrome wire, we have,

R’=(130E-8)* (1/(1.68E-8) ) (ohm)

=77.381 ohms.

Therefore, the required resistance of Nichrome wire is 77.381 ohms.

Answer 2

Answer:

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Explanation:

the write answer is

60 ohms