DIFFERENCE BETWEEN FREEZE AND TURN LAYERS OFF IN AUTO CAD

From outside you cannot identify the difference between
FREEZE and TURN LAYERS OFF.  If you Freeze a layer 
then its contents are not displayed.  And Similarly if you
turn off layer, its contents are not displayed.  Only 
difference between these FREEZE and TURN LAYERS OFF
is in display Memory.  When a layer is frozen the information
required to display it on screen is not loaded onto your
graphics card memory.  And when a layer is turned off,
all the information required to display the entities on that 
layer is loaded into your Graphic's Card's Memory.

if you turn off a layer, you get slower panning and zooming
on large/ complex drawings.

If you Freeze a layer, you get faster panning and zooming.

HOW TO CALCULATE KVA POWER REQUIREMENTS OF A GENERATOR

Procedure for  calculating the power (KVA) requirements of a Generator.  

example:  
A house has  10 tube lights, 5 Bulbs, 6 Ceiling Fans,  1 TV, 2 Personal Computers,  1 Laser Printer, 1 Iron Box etc.,

* write down  watts or Volts and Amps from each equipment
printed on its cover or in the manual. 

1 Tube Light = 40 watts, 10 Tube Lights = 10 X 40=400Watts
1 Bulb          = 60 watts,   5 Bulbs = 5 x 60 = 300 Watts
1 CeilingFan = 80 Watts,  6 C.Fans=6 x 80 =440 Watts
1 TV             = 135Watts,  
1 Personal Computer=275 Watts,  2 PC = 2 x 275=550Watts
1 Laser Printer = 375 Watts
1 Iron Box= 1000 Watts

*  Add all the Wattage
   400+ 300+440+135+550+375+1000=3200 Watts

   Total Watts = 3200

*  By Dividing with 1000 we get Kilo Watts
   3200/1000  =  3.2 Kilo Watts or KW

* Take Power Factor is 0.8 ( it depends upon the system
   Efficiency)

* By Dividing  3.2 KW by 0.8  we get the Required KVA

  3.2 / 0.8  = 4 KVA.

 Now select the Generator that is having  4 KVA
 Power generating capacity.

ANGULAR VELOCITY

Angular Velocity is the rate of change of Angular Displacement.

Angular Velocity is a Vector Quantity

SI unit of Angular Velocity is Radians/sec

The Direction of Angular Velocity vector is perpendicular to the plane of rotation.

                                      Angular Displacement

Angular Velocity  =      -----------------------------------------

                                                 time

WHAT IS POWER FACTOR

Power Factor is a measure of how effectively the current is being converted into useful work output. A load with a power factor 1.0 represents most efficient loading of suply and a 
load with power factor 0.5 represents poor supply or much higher losses in the supply system.

or

Power Factor is the ratio between KW (Kilo-Watt) and the KVA (Kilo-volt-amp).  where KW is the actual load power and
KVA is the apparent load power.

DIFFERENCE BETWEEN KW AND KVA

Power Factor is the only difference between KW and KVA.

Power Factor is generally is an approximation. Unless it is

represented by the manufacturer.  The value of KVA
is generally larger than the KW.

ex:  consider power factor  is 0.95  

KW(kilo Watt) = Power Factor * KVA

                      = 0.95 * KVA 

or 

KVA( Kilo Volt Amp) = KW (Kilo Watt) / Power Factor

                               =  KW (Kilo Watt) / 0.95