For some applications, it is important that the value of a resistance not change

Question

For some applications, it is important that the value of a resistance not change with temperature. For example, suppose you made a 6.90 komega resistor from a carbon resistor and a Nichrome wire-wound resistor connected together so the total resistance is the sum of their separate resistances. Part A: What value should the carbon resistor have (at 0 deg C ) so that the combination is temperature independent? Answer in Omega... Part B: What value should the Nichrome wire-wound resistor have (at 0 deg C ) so that the combination is temperature independent? Answer in Omega...

Explanation / Answer

given

Rc+Rn =6900

Rc+Rn=Rco[1+ac*dT]+Rno[1+an*dT]

Rc+Rn=Rco+Rno+dT[ac*Rco+an*Rno]

for temperature to be independent

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