Why Tesla’s Cybertruck switched to 48V (from ancient 12V): Think electricity like water in a hose. To deliver the same power over long distances, higher pressure (voltage) lets you use a thinner hose — less material, less weight. Same here: 48V means thinner wires, way less copper (expensive!), less heat, and the whole harness is much lighter. Plus, Tesla upgraded the car’s “nervous system” to fast Ethernet — so far fewer wires needed overall. Result: lighter truck, cheaper to build, more efficient. The industry has been stuck on 12V for 60+ years.