Convert KVAR to Farads (For Power factor improvement)

Here is a simple calculation for converting KVAR to Farads and vice versa. It is help you to find actual capacitor size. 

Example for calculating KVAR values.

Example:

A Single phase 380V, 50Hz, motor with rated current of 30A at a P.F (Power factor) of 0.6. The motor power factor has to be improved to 0.9 by connecting a capacitor in parallel with it. Calculate the required capacity of Capacitor in both KVAR and Farads.

Solution: Two Methods for Finding KVAR

Method 1: (By PF Multiplier Table)

Motor Input Power, P = V x I x Cosθ

                        = 380V x 30A x 0.6

                        = 6840 W

                        = 6840 / 1000 KW

                        = 6.84 KW

From PF Multiplier Table, improve PF from 0.60 to 0.90 is 0.849

Required Capacitor KVAR to improve P.F from 0.60 to 0.90

Required Capacitor, KVAR = KW x Table Multiplier of 0.60 and 0.90

= 6.84 KW x 0.849

= 5.807 KVAR

Playing PS3 games on PS4

All the Play Station lovers are now find an answer, is PS3 games can play in PS4??? About backwards compatibility of PS4 is now a hot topic for PS lovers. Sony is introducing a solution for PS4 backward compatibility issue, which is surely close to as well-designed as Microsoft slick and mostly free – alternative.

Transformer Rating in KVA

The power rating of a transformer generally expressed in KVA (Kilo Volt Ampere). KVA or apparent power is the product of Voltage and Current (Ampere). Generally a transformer involved in step up or step down of voltage where power is remaining same. Its mean, input power and output power of a transformer is equal; changes happen in voltage and current. In a step down transformer, voltage is decreasing at output and current is going higher then input.

There are two type of losses in transformer; Copper Losses and Core Losses (Iron Losses).   

When electrical currents pass through a conductor or winding, it produced heat. This transfer of energy is known as Copper losses.

LED (Light Emitting Diode) - New Concept of Lighting System

LED light bulb is developing by using of light – emitting diodes. Rated life of LED is much longer than other light bulb (incandescent, halogen, and fluorescent etc.). This things is occur for using “Solid – State” on a LED. Another feature of a Solid – state lighting is less vulnerable to failure due to vibration or shock.  

Where did they come from?





Nick Holonyak, Jr. is an American engineer and educator, invented light – emitting diode which is emitted visible red light instead of infrared light in 1962. Some factors kept the LED from advancing into general

Average Rated Life (ARL) of Light Bulb

Average Rated Life (ARL)

Working periods of half of the light bulb of a batch is known as Average Rated Life (ARL) of light bulb. Some times it is called a half – life. It can easily explain in this way; if 1000 bulbs are tested and 500 of its can reached 1000 hours, the Average Rated Life (ARL) is 1000 hours. Some bulbs can light for 100 hours; some are 500 hours, some within 650 hours. But ARL is that period, which half of the light bulb working.

Frequently on and off switches of light bulb reduced the ARL. This is less affected for Incandescent, halogen, and LED bulbs. Fluorescent, Compact Fluorescent (CFL), and HID bulbs are more affected by on/off cycles. Main thing is ARL of a light bulb is longer for once or twice turns on/off than many times turns on/off in a day.

Allen Key: A Revolutionary Tools

Allen Key:

Allen key is the most common and well known brand of hand tools. Especially it is a hex key wrench. This Allen brand is owned by Apex Tool Group.

William G. Allen patented a drawing for making hex socket set screws, in 1910. It was a new concept and avoided the classic square head protrusion. The new design of this safety screw reduced the chances of accident. “Allen wrench” and “Allen Key” these terms comes from Allen brand name and it refers to the “Hex keys”, the generic product category.

Tools - Makes The Way Easy

Types of Tools for Your Work.

Tools	American name	British name	Group
	Open – end Wrench	Open – ended Spanner	Common
	Box – end Wrench	Ring Spanner	Common

Vacuum Evaporation

Vacuum evaporation is a process where atmospheric pressure is reducing for create vapor of any liquid at minimum temperature. It is easily to describe for boiling of water. When atmospheric pressure is reduced, boiling temperature of water also decreased from 100˚C (212˚F) to lower. Standard atmospheric pressure is 1 bar (at Sea level). If you create vacuum for boiling water then it can turns into vapor in room temperature.

The normal boiling point of water is 99.97˚C (211.9˚F) at a 1 atm (101.325 kPa) pressure.  IUPAC (International Union of Pure and Applied Chemistry) recommended standard boiling point of water is 99.61˚C (211.3˚F) at a standard pressure of 100 kPa (1 bar).

Understanding mAH / Ah Battery Rating

In electrochemical system (Like electrical batteries), a SI unit is using frequently, which is Ah (Ampere – Hour) or mAH (milliampere – hour). Flowing of 1 ampere steady current or 3600 C charges for 1 hour is equal to 1 Ah. So, mAh is equal to one-thousandth of an ampere – hour or 3.6 C flowing for 1 hour.

Here,

1C (Coulomb) = 1A × 1s.

So, 1 Ah = 60 × 60 × 1C = 3600C [1 hour = 3600s].

And, 1 mAH = (3600 ÷ 1000) C = 3.6C