Skip to main content

Why Touch Screens Only Respond to Fingers: The Science Behind the Sensitivity

  I. Introduction Touch screen technology enables direct interaction with devices through touch. Using either capacitive or resistive methods, these screens detect user input, translating it into commands. Widely used in smartphones, tablets, and kiosks, touch screens offer intuitive navigation, eliminating the need for physical buttons and enhancing user experience across various applications. Understanding how touch screens work is crucial for users and developers alike. It enhances user experience by ensuring effective interaction, informs choices in device selection, and guides troubleshooting. For developers, knowledge of touch technology is vital for creating intuitive applications and improving interface design, ultimately leading to greater user satisfaction. This blog aims to explore why touch screens predominantly respond to fingers, delving into the science behind touch sensitivity. By examining the principles of capacitive and resistive technology, we will uncover the
Post a Comment

What is an alternator? || How is it different from generator?

 What is alternator?



As we know battery powers the electrics of the vehicle and alternator is the key player in battery charging system who feeds battery. An alternator is a device that converts mechanical energy into electrical energy and used in automobiles to charge the battery. Just like electrical generator it also works on the principle of Faradays law.

How is it different from generator?

Ø  Both alternator and generator converts’ mechanical energy into electrical energy but an alternator only produces AC whereas a generator may produce AC or DC.

Ø  In an alternator, magnet is the rotating part where as inn generator the field winding rotates.

Ø  Alternators are self-excited type but generators are not.

How does it work?

An alternator is a self-excited device in which the magnetic field is generated the moment we switch on the ignition switch which means electricity flows from battery to coils. To strengthen the magnetic field shoes are provided alternately- south and North Pole. Star connected 120 degree spaced coils are wound through an iron ring. As soon as the rotor rotates, current starts flowing in the coil. A three phase alternating current is collected in the output of the coils which then passes through the bridge rectifier to convert AC to DC since battery needs direct current to be charged.

Different parts of alternator.

1.      Pulley

The function of pulley is to rotate the rotor assembly as engine runs. It acts as a connector between engine and alternator. Commonly it is connected by belt drive.

2.      Housing

The function of housing is to protect the inner parts of an alternator and become a household of them. There are front and rear assembly, in between stator assembly is found.

3.      Rotor assembly

It generates a magnetic field because the electric current flows from the battery through the rotor coil. Two round shaped copper rings are connected to the rotor coil. The slip rings help in conducting the electric current when the rotor shaft is spins. The moment rotor assembly rotates; the magnetic field will cut the stator coil and generates electrical energy. The faster the rotor rotations, more is the electric current induced in the stator coil. To strengthen the magnetic field, pole shoes are employed which is made of soft iron.



4. Stator assembly

The stator is combination of three stationary windings that surrounds the rotor. The stator assembly produces electric current as the rotor assembly cuts the stator coil. The three coils are round shaped so that the rotor assembly can rotate inside the stator coil.

A star connection is preferred in which the wire terminals from the stator windings are connected to a neutral junction. Star connection is preferred over delta because it can provide good current output.



5. Voltage regulator

The voltage regulator regulates the amount of voltage from the alternator to the battery to happen the charging process. As we know, "faster the rotor rotations, more is the electric current in stator coil," so the voltage regulator is used to control the output voltage of alternator.

In case the alternator output voltage is below 14.5 volts. In that case, the voltage regulator reacts by increasing current through the field coil of the rotor. It causes the voltage to increase. Alternately, if the alternator output voltage is above 14.5 volts. In that case, the voltage regulator will decrease the current through the field coil of the rotor, so it causes the output voltage to decrease and provide desired output so as to keep the battery life healthy.



 What happens when engine runs at a faster speed?

It is very clear that the alternator is driven by the engine. More the engine speed more will be the voltage produced. But beyond certain range it may affect the battery health. To have a safe battery health a voltage regulator is employed which regulates the voltage and allows the desired voltage only even though it produces more. Some commonly used integrated circuit(IC) are CS3361, MC33092A etc.

Comments

Post a Comment

Popular posts from this blog

Top 5 technical skills that will be on demand in 2021

If we can’t see the world behind the mountain does not mean it ends up there probably we don’t put effort to climb up and visualize the existence. In extension to this we may say there is no job scarcity in India but the skill gap is. Companies are eying on the professionals who suits best to bridge their requirement.   Here are 10 top technical skills in-demand we should focus on. 1.     Artificial Intelligence(AI) 2.   Cloud computing 3.    Data Analytics 4.     Internet of Things (IOT) 5.   Virtual Reality (VR ) 1.      Artificial Intelligence(AI): As per the survey of the world economic forum, artificial intelligence will create 133 million new jobs by 2025. It also is expected that the machines will do more work than the humans by 2025.   Artificial intelligence refers to the way a machine can easily mimic humans and execute tasks precisely even if it’s more complex. AI is continuously evolving as a most suitable aid for many different industries. The expectations in future from A
5 comments
Read more

Reviving the past: Mercury arc rectifiers in modern engineering

  I.                     Introduction: An electrical device that transforms alternating current (AC) into direct current (DC) is called a mercury arc rectifier. It works on the basis of the mercury arc valve principle, which depends on how mercury vapor responds to an electric field. In 1902, Peter Cooper Hewitt created the mercury arc rectifier, which was used to transmit high-voltage direct current power as well as to power motors, transmissions, electric cars, and trains. Before the invention of semiconductor rectifiers like diodes and thyristors, this was the first way of high power rectification. Mercury-arc rectifiers were almost completely replaced by semiconductor rectifiers after their creation because of their lower price, improved dependability, easier maintenance, and decreased risk to the environment. Researchers have brought back this old technology. II.                   The rise of mercury arc Rectifiers: Here's how obsolete technologies like mercury arc
Post a Comment
Read more

Pressure measurement, Pressure transducers, Lecture Note on Pressure transducers

Introduction: The pressure exerted by a static fluid depends only upon the depth of the fluid, the density of the fluid, and the acceleration of gravity. Mathematically,  P = ρgh Static and Dynamic Pressure:   Static pressure: At any point in the fluid, the small chunk of fluid experiences the same pressure from all direction and this pressure is called static pressure. Dynamic pressure: In a fluid flow the stagnation of flow results in conversion of kinetic energy into an additional pressure on the surface which is called as dynamic pressure. When a flat plate is kept against the flow, the fluid is stagnated and creates an additional pressure on the plate which is called as stagnated pressure. Stagnated pressure= Dynamic pressure + static pressure Dynamic pressure= Stagnated pressure - static pressure Pressure measuring transducer:  Often pressure is measured by transducing its effect to a deflection through use of a pressurized area and either a gravitational or elastic
3 comments
Read more