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Standard X

Physics

Ohmic and Non Ohmic Resistors

How is dynami...

Question

How is dynamic resistance(say $r$ ) of a non-ohmic resistor different from ohmic resistance(say $R$ ) of an ohmic resistor

R

is variable,

r

is constant

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R

is constant,

r

is constant

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R > 0, r \geq 0

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R > 0

r

can be negative, zero or positive

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Solution

The correct option is D $R > 0$ , $r$ can be negative, zero or positive
Ohmic resistance always show a positive value of resistance.
Ex: Copper
Non-ohmic conductors may have a positive dynamic resistance. In such a case, $s l o p e > 0.$
Ex: Diode
Non-ohmic conductors may have a negative dynamic resistance. In such a case, $s l o p e < 0.$
Ex: DIAC.

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How is dynamic resistance(say r) of a non-ohmic resistor different from ohmic resistance(say R) of an ohmic resistor

How is dynamic resistance(say $r$ ) of a non-ohmic resistor different from ohmic resistance(say $R$ ) of an ohmic resistor