A physics student has a single-occupancy dorm room. The student has a small refrigerator that runs with a current 4 A, a lamp that contains a 100-W bulb, an overhead light with a 60-W bulb, and various other small devices adding up to 8 W. All the appliances run on a voltage of 110 V. Overall Hint a. What is the total power used by the dorm room (while the refrigerator runs)? Total power used by the dorm room is W. b. Assuming that the power plant for the electricity is 10 km away and uses 00-gauge copper wire (diameter 9.266 mm), how much power is dissipated in transmission (remember to count the return wire), if the power plant is directly providing the 110-V? (To be more precise, the power plant is providing the voltage it needs to provide, so that the voltage at the dorm room is 110 V.) Hint for part (b) Power of W is dissipated in transmission at 110 V. c. The most common way to increase the efficiency of power transmission is by using higher voltage for long-distance transmission (and it is "down transformed" nearer the consumers of electricity). Assuming that the same amount of power calculated in (a) is transmitted, how much power is dissipated in transmission, if the power plant provides the power at 110 kV? (To be more precise, the power plant is providing the voltage it needs to provide, so that the voltage at the transformer station is 110 kV.) Hint for part (c) Power of W is dissipated in transmission at 110 kV.
A physics student has a single-occupancy dorm room. The student has a small refrigerator that runs with a current 4 A, a lamp that contains a 100-W bulb, an overhead light with a 60-W bulb, and various other small devices adding up to 8 W. All the appliances run on a voltage of 110 V. Overall Hint a. What is the total power used by the dorm room (while the refrigerator runs)? Total power used by the dorm room is W. b. Assuming that the power plant for the electricity is 10 km away and uses 00-gauge copper wire (diameter 9.266 mm), how much power is dissipated in transmission (remember to count the return wire), if the power plant is directly providing the 110-V? (To be more precise, the power plant is providing the voltage it needs to provide, so that the voltage at the dorm room is 110 V.) Hint for part (b) Power of W is dissipated in transmission at 110 V. c. The most common way to increase the efficiency of power transmission is by using higher voltage for long-distance transmission (and it is "down transformed" nearer the consumers of electricity). Assuming that the same amount of power calculated in (a) is transmitted, how much power is dissipated in transmission, if the power plant provides the power at 110 kV? (To be more precise, the power plant is providing the voltage it needs to provide, so that the voltage at the transformer station is 110 kV.) Hint for part (c) Power of W is dissipated in transmission at 110 kV.
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Chapter1: Units, Trigonometry. And Vectors
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Transcribed Image Text:A physics student has a single-occupancy dorm room. The student has a small refrigerator that runs with a
current 4 A, a lamp that contains a 100-W bulb, an overhead light with a 60-W bulb, and various other
small devices adding up to 8 w. All the appliances run on a voltage of 110 V.
Overall Hint
a. What is the total power used by the dorm room (while the refrigerator runs)?
Total power used by the dorm room is
W.
b. Assuming that the power plant for the electricity is 10 km away and uses 00-gauge copper wire
(diameter 9.266 mm), how much power is dissipated in transmission (remember to count the return
wire), if the power plant is directly providing the 110-V? (To be more precise, the power plant is
providing the voltage it needs to provide, so that the voltage at the dorm room is 110 V.)
Hint for part (b)
Power of
W is dissipated in transmission at 110 V.
c. The most common way to increase the efficiency of power transmission is by using higher voltage for
long-distance transmission (and it is "down transformed" nearer the consumers of electricity).
Assuming that the same amount of power calculated in (a) is transmitted, how much power is
dissipated in transmission, if the power plant provides the power at 110 kV? (To be more precise, the
power plant is providing the voltage it needs to provide, so that the voltage at the transformer
station is 110 kV.)
Hint for part (c)
Power of
W is dissipated in transmission at 110 kV.
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