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> chargers and cables are advertised with the wattage they support, but it's really the voltage and current that matters. watts = volts * current
by nerfhammer 5y ago
> chargers and cables are advertised with the wattage they support, but it's really the voltage and current that matters.
watts = volts * current
- kccqzy 5y agoGP's point is that although chargers are labeled with wattage, they can't output any combination of volts and currents as long as they multiply to the stated wattage. Can you take a normal 100W charger and ask it to output 100V and 1A? It can't. The Apple 29W charger supports two configurations only: 14.5V × 2A, or 5.2V × 2.4A The Apple 30W charger supports these four instead: 20V × 1.5A, 15V × 2A, 9V × 3A, 5V × 3A Do you see a problem here?