3 ms·
many post like your's turn around those formulas V=RI and W=VI combined to give WireLossInWatt = RI² assume a 120W bulb and a 2.5mm diameter 1km long c
by nick__m 5y ago
many post like your's turn around those formulas
V=RI and W=VI
combined to give
WireLossInWatt = RI²
assume a 120W bulb and a 2.5mm diameter 1km long copper conductor (around 7ohm).
at 120V you need 1A so you lose 1²A² × 7ohms = 7W
at 12V you need 10A so you lose 10²A² × 7ohms = 700W
That example with a small diameter long cable is a bit extreme but I hope it's illustrative