DC power could be transmitted using a wire over distances of a couple miles. On
ID: 1979825 • Letter: D
Question
DC power could be transmitted using a wire over distances of a couple miles. On the contrary, AC power may be transmitted using a wire over much greater distances.a) What physical quantity needs to be minimized to maximize the reach of wired power transmission from a power station to a final user (house, factory, etc.)?
b) What physical quantity was accordingly changed at the AC power station?
c) Why would have this change not be acceptable for the final user at the end of the transmission line if the power station was instead transferring DC power?
Explanation / Answer
Answer: A] Physical Quantity: The resistance of the wires need to be minimized such that wired power transmission can reach long distances. B] Physical Quantity: The coils within the transformers at the AC power station were changed to increase voltage output (stepped up). C] Transformers (using coils) may only apply to alternating currents (AC). If you used DC power, all the power would have been lost as heat from the resistance of the wires by the time it reaches your home. It's a long distance.
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