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You want to make a resistor of 1.2 out of a carbon rod of diameter 1...

You want to make a resistor of 1.2 omegacap.gif out of a carbon rod of diameter 1 mm. How long a piece of carbon do you need?

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Answer #1

Given: R=1.200 de Imm thus; r= = 0.5 mm = 0.5x10-3m Since Resistivity of carbon is: 8 - 5.0 X10-4R So, Using formula: R=PL Ā

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