when load on the electric system increase frequency of the system will decrease resulting in higher intake at powergenerators. If higher intake is not net by powergeneration stations entire power system will collapse. It is called grid failure.
Another AnswerAn increase in load will result in an increase in load current.
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Electrical load forecasting. "A good electrical load forecast has a direct and significant impact on costly generating unit startups and shutdowns, energy purchases, managing system demand as well as scheduling system upgrades based on predicted load growth."
Unbalance in three phase system puts quite a negative impact on the system and the three phase loads like motor. Motors tend to draw additional current for same power output, may increase noice, may increase heat generation.Over all losses go up in the system
Any system you design will have an input and an output. The output will connect to the input of another system which will load it, so when you are designing any system you have to consider how loading it will effect the circuit performance.
You can increase load on a bus power system by increasing the bus active power demand ans reactive power demand.
In terms of electrical engineering, the term "bridging" refers to connecting a load to two amplifiers. This is done to increase the voltage. It can also refer to the use of an impedance with a low source to power an impedance with a larger load, again to maximise the voltage.