Today's technology has provided for convenience and efficiency. Both are good, however new technology can add stress to our electrical systems.
For resistive type loads typical in most lighting and receptacle loads the current and voltage sine waves would be in phase and the power factor is not really an
issue, however for newer electronic equipment, air conditioning compressors pumps, motors or appliances, out of phase current and voltage sine waves puts additional stress
on generator systems, requiring more current flow for the same use of energy.
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