Master Electrician Electric Contractor Richmond VA
- Henrico County, VA
- Electrical Contractor
I must disagree with that generalization. Motors do indeed attempt to be constant-power loads and behave as you described (current varies inversely with voltage), but the vast majority of residential loads tend to be constant-impedance loads (current varies proportionately with voltage).The POCO metering device generally uses CT's at the service entrance point to measure how much $$ is passing through, the greater the voltage drop at the point of use, the more current the device uses (generally, but not always) to achieve its rated output. Ever notice a motor that has a two amperage ratings, one for 230V and and one for 208V? The same is true for most loads, as voltage drops, current goes up, not to mention incidental heating of the structure, something we don't need in the south!.
With incandescent bulbs, for one example, if the voltage sags, so does the current. Only if a larger bulb is substituted would the user cause an increase in $$ as a result. With electric heat, the heat will run cooler, but will need to run longer in compensation to keep the thermostat satisfied.