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Solved: In periods of peak demand, power companies lower
Chapter 15, Problem 51TAS(choose chapter or problem)
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.)
Questions & Answers
QUESTION:
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.)
ANSWER:Step 1 of 4
Tabular presentation of values is shown below,
Power |
Current |
Voltage |
