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Chapter 4: Q23E (page 842)

(a) What is the resistance of a Nichrome wire at 0.0°Cif its resistance is 100.00Ωat 11.5°C(b) What is the resistance of a carbon rod at 25.8°Cif its resistance is0.0160Ω at0.0°C

Short Answer

Expert verified
  1. The resistance of Nichrome wire at0.0°CisR0=99.5Ω
  2. The resistance of carbon rod25.8°C atRT=0.0158Ω

Step by step solution

01

Determine the formula to find the resistance

Use the formula of resistance dependence temperature

02

Determine the resistance of a nichrome wire at 0.0°C

Use the formula found above

Thus , the resistance of nichrome wire at 0.0°C, if its resistance is 100.00Ωat 11.5°Cis99.5Ω

03

Determine the resistance of carbon rod at 25.8°C

Use the formula of resistance dependence temperature

Substitute the values

Here, ∞is negative because as the temperature increases, the resistance of the carbon rod decreases.

Therefore, the resistance of carbon rod at 25.8°C, if its resistance is 0.0160Ωat0.0°Cis role="math" localid="1664188564459" 0.0158Ω

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