If the resistance of a certain copper wire is

Asked by admin @ 20/08/2021 in Chemistry viewed by 342 People

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

Choose the option 25 ohm
30 ohm
60 ohm
45 ohm

Answered by admin @ 20/08/2021

At 20°C :

Copper resistivity = 1.75 x 10**-8 ——————————-> R = 1 Ohm

Ni 80 Cr 20 alloy resistivity = 1.05 x 10**-6 —————→ R = 60 Ohms

Ni 60 Cr 12 Fe 28 alloy resistivity = 1.20 x 10**-6 ———-> R = 68 Ohms

Ni 30 Al 65 Cr 5 alloy resistivity = 1.40 x 10**-6 ———→ R = 80 Ohms

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