Hey! I need help really bad and do not know how to solve this problem. Please he

Question

Hey! I need help really bad and do not know how to solve this problem. Please help! Thanks For some applications, it is important that the value of a resistance not change with temperature. For example, suppose you made a 4.7kilaohm resistor from a carbon resistor and a Nichrome wire-would resistor connected together so the total resistance is the sum of their separate resistances. What value should each of these resistors have (at 0 degrees Celsius) so that the combination is temperature independent.

Explanation / Answer

Keep in mind that for a critical application, you need some sort of feedback loop. No materials resistance-temperature curve is perfectly linear across the temperature spectrum. If this is a homework problem, your book probably has a chart of temperature coefficients. Use these, since in reality the coefficients vary widely with quality and manufacturer. This is a simple problem of algebra, R1*C1=R2*C2 and R1+R2=4.70kOhm. Plug in the coefficients, and you have your solution.

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