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

Calculate the total power supplied to the divider circuit, There is often a...

There is often a need to produce more than one voltage from a single supply using a voltage divider. For example, the memory components of many personal computers require voltages

State advantages of washing machine, State advantagesof Washing machine ...

State advantagesof Washing machine Main advantages are that these washing machines are fully automatic (wash programs are fully stored) it makes them easy to use, they are chea

Measuring equipment of ac-dc voltage and waveforms, Procedures and methods ...

Procedures and methods of the experiments A).      In order to measure the true RMS values of the currents and voltages, students used the true RMS multimeter. It requires two

Calculate reactive power to be delivered by the capacitor, A single-phase s...

A single-phase source delivers 100 kW to a load operating at 0.8 lagging power factor. In order to improve the system's efficiency, power factor improvement (correction) is achieve

Representation of the control system, Question: (a) The forward path t...

Question: (a) The forward path transfer function of a unity feedback control system is given by: (i) Draw the labelled block diagram representation of the control system.

Write a brief note on mmx technology, Write a brief note on MMX technology....

Write a brief note on MMX technology. MMX (Multimedia extensions) technology adds 57 new types of instructions to the Pentium - 4 microprocessors instruction set. The MMX tech

Matlab coding for powerflow analysis of fast decoupled metho, please give t...

please give the source coding of fast decoupled method

D.c.machines, can voltage regulation be negative?why?

can voltage regulation be negative?why?

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