Determine the resistance and temperature-coefficient, Electrical Engineering

Assignment Help:

Determine the resistance and temperature-coefficient:

A platinum coil has a resistance of 3.146 Ω at 40oC and 3.767 Ω at 100oC. Determine the resistance at 0oC and the temperature-coefficient of resistance at 40oC.

Solution

Rt  = R0  + α0  R0  (t - t0 )

Take t0 = initial temperature = 0o.

Rt  = R0  + α0  t R0

= R0 (1 + α0 t )

R100 = R0 (1 + 100 α0) at          t = 100 C          ------- (i)

 

And        R40 = R0 (1 + 40 α0 )         at  t = 40oC           ----------  (ii)

From Eqs. (i) and (ii)

3.767 /3.146    = 1 + 100 α0/1 + 40 α0   ⇒ α = 0.00379 pero C

From Eq. (i)

∴ 3.767 = R0  (1 + 100 × 0.00379)

R0 = 2.732,

α40 =   1/( (1/ α0) + (t2  - t1 ) =1/ (1/0.00379) + (40 - 0) = 1/304 per  o C


Related Discussions:- Determine the resistance and temperature-coefficient

Speed and torque control of polyphase induction motors, Speed and Torque Co...

Speed and Torque Control of Polyphase Induction Motors The induction motor is valuable in so many applications because it combines simplicity and ruggedness. Although a good nu

What is program counter in 8085, Program counter holds the address of also ...

Program counter holds the address of also the first byte of the next instruction to be fetched for implementation or the address of the next byte of a multi byte instruction, which

Magnetic circuits, Suppose we have a coil wound onto a ring of material wit...

Suppose we have a coil wound onto a ring of material with relative permeability µ r . Provided that the relative permeability µ r  >> 1, then the magnetic flux lines will s

Explain working of single-phase induction motors, Q. Explain working of Sin...

Q. Explain working of Single-Phase Induction Motors? For reasons of simplicity and cost, a single-phase power supply is universally preferred for fractional-horsepower motors.

State the drawbacks of in band and out band voice signalling, a. Enlist the...

a. Enlist the benefits and drawbacks of in band and out band voice signalling? b. Describe Channel Associated mode, Channel Non-Associated mode and QuasiAssociated mode of commo

What is meant by blanking, a. Explain the following terms: (6) (i) Persi...

a. Explain the following terms: (6) (i) Persistence of vision (ii) Flicker in motion pictures b. What is meant by blanking? What is the need of blanking pulses? Compare th

Explain what is doping, What is meant by doping? Doping: Semiconduct...

What is meant by doping? Doping: Semiconductors in its extremely pure form are termed as intrinsic semiconductor such intrinsic semiconductor to which several suitable impur

Electrical System Design, List four sources of information which are essent...

List four sources of information which are essential to the designer of this electrical installation

External frequency compensation of operational amplifier, Q. External Frequ...

Q. External Frequency Compensation of operational amplifier? For applications requiring a more extended high-frequency response, there are op amps with no internal compensation

Explain quantizing analog signals, Explain Quantizing Analog Signals? ...

Explain Quantizing Analog Signals? A common analog-to-digital conversion pipeline contains a spectrum limiter (a simple low-pass or bandpass filter), a sample and hold circuit

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd