Metal film resistor, Physics

Assignment Help:

MANUFACTURING: Nickel film is deposited on ceramic substrate. This is done by electrolytic deposition of nickel in a chemical bath containing hypophosphate. The sheet resistance is controlled by the amount of nickel and Ni-P alloys depositing on substrate.

SPECIFICATIONS:

Ohm values                                                                         0.2 ohm/sq. Cm to 10000 ohm/sq. Cm

Tolerances                                                                           > 2%

Stability                                                                               2%

Temperature coefficient of resistance                                       <+200 ppm /0C

Working voltage                                                                    300 volts

Working temperature                                                             -40 to 1500C

APPLICATIONS: Photolithographic techniques are used to manufacture this type of resistor. Alloy of nickel and chromium in a ratio 80: 20 or 50: 50 are deposited on ceramic substrate by sputtering in vacuum. Then a resistive film pattern of predetermined length and width is etched out with the help of masks. This process is cost-effective for mass production. Very low mass production. Very low temperature coefficient of resistance and stability are attained by adding small quantities of copper, aluminium, or iron.

SPECIFICATIONS:

Ohm range                                                                           1 ohm/sq-cm to 5 kilns-ohms/sq-cm

Temperature coefficient of resistance                                                                    50 ppm /0C

APPLICATIONS: There are used in semi-precision and precision applications.


Related Discussions:- Metal film resistor

Illustrate the current-voltage characteristic curves, Illustrate the curren...

Illustrate the current-voltage (I-V) characteristic curves if a junction diode in reverse and forward bias.

Find the potential difference, A particle with a charge of -1.5uC and a mas...

A particle with a charge of -1.5uC and a mass of 2.5x10-6kgis released from rest at point A and accelerates toward point B, Arriving there with a speed of 42m/s. (a) What is the po

Forces, Forces: If a Force is applied to a body, it will cause that bod...

Forces: If a Force is applied to a body, it will cause that body to move.  A body that is already moving will change its speed or direction.  Note that the term 'change its spe

Calculate power required to operate the fan, A centrifugal fan is used to p...

A centrifugal fan is used to pump air. The fan rotor is 1 ft in diameter, and the blade spacing is 2 in. The air enters with no angular momentum and exits radially with respect to

Thermal detectors method of detection of ultrasonic waves, Explain the ther...

Explain the thermal detectors method of detection of ultrasonic waves. Thermal detectors method: It is the most generally used method of detection of ultrasonic waves. In th

Resistance, RESISTANCE: An electric current is a flow of free electrons...

RESISTANCE: An electric current is a flow of free electrons through a conductor. The size of current flowing through a conductor for a given applied voltage depends on: • T

Determine the force in the hydraulic cylinder, Determine the force in the h...

Determine the force in the hydraulic cylinder AB to 3 significant places in kN if the weight of the bucket and the load is P48 kN acting at G. Neglect the weight of all other membe

Write s.i. unit of magnetic flux, Explain electrical conductivity of a cond...

Explain electrical conductivity of a conductor and give its S.I. unit. Write S.I. unit of magnetic flux. Is it a vector or a scalar quantity?

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