Is it possible to have a resistor with negative resistance?

Question

If the answer is yes, then provide examples of such materials. If it is not possible, then explain why not.

Answer 1

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I'm fairly certain that negative resistance would be the same as negative friction... I don't think it is possible. Otherwise, electricity would flow without a difference in voltage potential. I think that the concept has been exhibited in a circuit, but not a standalone component, like a resistor.

Answer 2

Negative Resistor

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Answer 3

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RE:

Is it possible to have a resistor with negative resistance?

If the answer is yes, then provide examples of such materials. If it is not possible, then explain why not.

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Answer 4

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ℰ = V1 + V2 ℰ = Ir + IR ℰ = I∙(r + R) I would assume the current is negative in this case. It is possible to have a negative resistance, but only with special resistors and certain scenarios. Current will read positive or negative, depending on how the ammeter is wired.

Answer 5

A passive circuit element which adds energy to a circuit, rather than removing it? That would be a free-energy device, and the laws of thermodynamics prohibit such devices from existing. You can get as creative as you like, but you won't find a way to build such a device.

Answer 6

No, because that would create big problems for conservation of energy if it were to exist.

Answer 7

In parallel. 1/Rt = 1/R1 + 1/R2 . Use this formula

Answer 8

Wouldn't it then be considered a super conductor, not a resistor?