Alternating Current and Direct Current
Electrical standards emerged through technical tradeoffs, business competition, and infrastructure investment.
In the late nineteenth century, alternating-current and direct-current systems competed to supply electricity. AC transformers made it practical to change voltage for transmission and distribution, contributing to the expansion of regional power networks.
The so-called current wars involved engineering, business competition, publicity, and safety concerns. Modern grids use both AC and high-voltage DC in different settings, so the historical outcome was not proof that DC could never transmit power over distance.
If DC systems had become dominant earlier, grid design and conversion technologies might have developed differently. The claim that power plants would have been required on every city block simplifies technical options and later innovations.
Infrastructure standards can lock in choices that are efficient at one moment and adaptable later. Comparing technologies requires attention to the whole system, including conversion, maintenance, cost, and geography.
Comparing technologies requires attention to the whole system, including conversion, maintenance, cost, and geography.
When I compare two technologies, am I judging a component in isolation or the larger system it must serve?