Thermistors Resistance

Thermistors Resistance
a) increases as heat increases
b) decrease as heat increases
C) remains constant
d) It is nowhere related to heat.

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harshil102

  • Sep 28th, 2010
 

Thermistors can be classified into two types, depending on the sign of k. If k is positive, the resistance increases with increasing temperature, and the device is called a positive temperature coefficient (PTC) thermistor, or posistor (in some applications also referred to as sensistor). If k is negative, the resistance decreases with increasing temperature, and the device is called a negative temperature coefficient (NTC) thermistor. Resistors that are not thermistors are designed to have a k as close to zero as possible(smallest possible k), so that their resistance remains nearly constant over a wide temperature range.

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kesavamoorthy

  • Apr 6th, 2011
 

To easy to remember when you keep this formula in your mind.

Delta R=kDelta T ,
where,
ΔR = change in resistance
ΔT = change in temperature
k = first-order temperature coefficient of resistance
Thermistor is classified as based on the value of constant 'k'. If the 'k' value is positive, resistance increases as temperature increases called as PTC(Positive temperature Co-efficent). If the 'k' value is negative, resistance decreases as temperature increases. Its called as NTC(Negative temperature Co-efficent).

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devworx

  • Jan 18th, 2015
 

can be Ntc ( N - negative) as θ ↑ ⇒ R ↓
and Ptc (P - positive) as θ ↑ ⇒ R↑

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