Why is the voltage to whatever appliance is being used reduced by this amount? What is the effect on the appliance?
Added by Lourdes P.
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This reduction can occur when the appliance is operating, especially if it draws a significant amount of current. Show more…
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In periods of peak demand, power companies lower their voltage. This saves them power (and saves you money!). To see the effect, consider a 1200-W coffeemaker that draws 10 A when connected to 120 V. Suppose the voltage is lowered by 10% to 108 V. By how much does the current decrease? By how much does the power decrease? (Caution: The 1200-W label is valid only when 120 V is applied. When the voltage is lowered, the current is lowered, so the power output of the toaster’s heating coils drops, which cools the coil and lowers its resistance. However, for this problem assume the change in resistance is slight.)
In U.S. residences, electrical power is generally utilized at a nominal voltage of $120 \mathrm{V} \mathrm{ms},$ What problems would become pronounced if the power distribution system and household appliances had been designed for a lower voltage $(\operatorname{sag}, 12 \vee \mathrm{rms}) ?$ For a higher voltage (say. $12 \mathrm{kV}) ?$
In periods of peak demand, power companies lower their voltage. This saves them power (and saves you money!). To see the effect, consider a 1200-W coffeemaker that draws 10 A when connected to 120 V. Suppose the voltage is lowered by 10% to 108 V. By how much does the current decrease? By how much does the power decrease?
Vishal G.
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