Before we discuss on any of the previously stated factor, let us first define some important terms the we should be familiar with:
LOAD GRAPH/CURVE - is a graphic record showing the power demands for every instant during a certain time interval. The area under the load curve is equal to the energy or kW-hr delivered to the particular load.
CONNECTED LOAD - The connected load on any system or part of the system is the combined continuous rating of all the receiving apparatus on the consumer's premises that is connected to the system under consideration.
DEMAND - it is the load usually expressed in kW, kVA averaged over a suitable and specified interval of time of short duration.
MAXIMUM DEMAND or PEAK LOAD - is the greatest of all the demands that have occurred during a given period. It is measured according to specifications, over a prescribed time interval during a certain period such as a day, a month, a year.
AVERAGE LOAD - it is defined as the average demand during a certain period of time. Utilities usually computes average load in monthly basis. So that is the sum of all daily peak demands divided by the total number of days.
(Rafael D. Seva Jr.)
KILOWATT (kW) – also referred to as the useful power or the true power. This is the power needed to operate a certain electrical device or apparatus.
KILO-VOLT-AMPERE REACTIVE (kVAR) – also referred to as the phantom power and reactive power.
KILO VOLT-AMPERE – also referred to as the apparent power. This is the power required to be drawn from the source.