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

Transmission and distribution losses - electrical energy, Transmission And ...

Transmission And Distribution Losses - Electrical Energy Previously, you have learnt that there are inherent losses in transmission and distribution of electrical energy from

Integrated circuit components, You are required to design and document the ...

You are required to design and document the hardware design for Lift Control Unit (LCU) as required by the questions/specification in section 2 above, based on a 68HC12D60 microcon

What is faithful amplification, What is faithful amplification. What are ba...

What is faithful amplification. What are basic condition for faithful amplification. Describe : (a) Peak Inverse voltage. (b) Maximum forward current. (c) Knee voltage

What is the function of 8254 programmable interval timer, What is the funct...

What is the function of 8254 Programmable Interval Timer? 8253 or 8254 Timer Description and Initialization PTI that is programmable Interval Timer/Counter) 8253

Student, Can I get some ideas for power system stability simulation using M...

Can I get some ideas for power system stability simulation using Matlab?

Find the initial current, In the circuit shown below, the capacitor initial...

In the circuit shown below, the capacitor initially has a voltage across it 4 Volts (at t = 0). a.  Write down the expression for V C (t) when the switch is closed. b.  Writ

Explain ferrimagnetic magnetic materials, Explain Ferrimagnetic magnetic ma...

Explain Ferrimagnetic magnetic materials. Ferrimagnetic Materials: In such materials unequal magnetic dipoles are lined up anti-parallel to each other. And permeabilities are

Define the term assembler directives, Define the term assembler directives....

Define the term assembler directives. An assembler directive is a statement to provide direction to the assembler to perform the function of assembly process. The assembler di

What is UNIVERSAL SERIAL BUS, What is USB? USB: The USB (UNIVERSAL SERI...

What is USB? USB: The USB (UNIVERSAL SERIAL BUS) is intended to join peripheral devices as keyboards, modems, a mouse and sound cards to the microprocessor by a serial data pat

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