Special resistor materials: platinum, Physics

Assignment Help:

Platinum:

Atomic number

78

Symbol

pt

Atomic weight

195.09

Discovery

Olloa 1735

Electronic configuration

5d9

Melting point

17750C

Electrical resistivity

10.9*10-8 ohm-m.

Properties:

1.      It is a white greyish metal.

2.      It has a good tensile strength.

3.      It is one of the most stable metals under combined action of corrosion and electrical erosion.

4.      It does not corrode under most adverse atmospheric condition.

5.      It can be easily drawn into wires.

Uses: Platinum finds application as a heating element in laboratory ovens and furnaces. Platinum-rhodium thermocouple is used for measurement of temperatures up to 16000C. It is also used as electrical contact material and as material for grids in special purpose vacuum tubes.


Related Discussions:- Special resistor materials: platinum

Find total equivalent internal resistances of the batteries, For the circui...

For the circuits shown in Figure the resistors show the internal resistance of the batteries. Find, in each case: (i) The total e.m.f. across PQ (ii) The total equivalent in

Lqws of motion, why newtons 2nd law is called the real law of motion?

why newtons 2nd law is called the real law of motion?

Units and dimensions, what is the dimension and unit of bulk modulus,stress...

what is the dimension and unit of bulk modulus,stress,strain and moment of interia

Places where friction occurs, Places where friction occurs Locate the p...

Places where friction occurs Locate the places on several mechanical devices where parts rub together. Roller skates, pulleys and the wheels of toys often required oil. Try to

Define optic axis of a crystal, Q. Define: optic axis of a crystal. In...

Q. Define: optic axis of a crystal. In a double refracting crystal there is a particular direction in which both the rays travel with same velocity. This direction is called a

What is direction of the current, Q. What is direction of the current? ...

Q. What is direction of the current? The path of the magnetic field at the centre of a horizontal current-carrying loop of wire is straight downward. The magnetic field is affe

Reflection law, Reflection law For a wavefront intersecting reflecting...

Reflection law For a wavefront intersecting reflecting surface, the angle of incidence is equivalent to the angle of reflection, in the similar plane described by the ray of i

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