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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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What does the area under the load curve represent?
System voltage
Current
Energy consumed
Maximum demand
Energy consumed
The load curve is a graphical representation of the electrical load on a power system plotted against time. The area under this curve represents the total energy supplied by the power station to the consumers over the given time period.
The load curve is a graphical representation of the electrical load on a power system plotted against time. The area under this curve represents the total energy supplied by the power station to the consumers over the given time period.
E=∫t1t2P(t)dt — represents energy as the integral of power over time
LoadFactor=MaximumDemandAverageLoad — helps analyze the utilization efficiency of the station
Since power P is the rate of energy consumption and is defined as P=dtdE, integrating the power with respect to time over a specific interval gives the total energy. Mathematically, the area is the integral of the load (kW) versus time (h), resulting in kilowatt-hours (kWh).
The ordinate of the load curve represents the load in kW or MW.
The abscissa represents time in hours.
The area under the load curve provides the total energy generated in kWh or MWh.
Load factor is derived from the load curve to measure the economy of the power plant.
Helps in selecting the size and number of generating units.
Assists in calculating the operating cost of the power station.
Does not explicitly provide information about the momentary peak current without voltage data.
Changes significantly based on daily, seasonal, and environmental conditions.
Determining the generation schedule of a power plant.
Designing the capacity of utility substations.
The load curve can be plotted on a daily, monthly, or annual basis.
Option A (System voltage) and Option B (Current) are instantaneous electrical parameters, not cumulative energy.
Option D (Maximum demand) is a single peak point on the curve, not the integral area.
C is correct — The area under the load curve, which plots power versus time, represents the total energy consumed (kWh) during that specific interval.
Remember that while the load curve gives energy, the 'Load Duration Curve'—derived by arranging loads in descending order—is used specifically for determining the base load and peak load plant capacities.