Comment on Why are laptop adapters so much larger than phone adapters of same power rating?
spankmonkey@lemmy.world 9 months ago
In general with electrical things, the longer it will be operating at a high usage the bigger the need for heat dissapation and more robust parts. Phones of the same power rating still have less juice, as in smaller batteries, and have less power usage overall.
While the power rating may be the same, the volume of energy is not the same. Like running water through a straw and a hose can have the same pressure but way more water is going through the hose.
Watts are part of the electrical properties along with volts and amps. Laptop chargers have the same watts and volts but more amps.
This is incorrect, Watts (power) is the product of amps * volts. The formula is P = IV. Anything with the same power and voltage will have the same amps.
The volume of power consumed would be Watts * time and gets you to capacity and usage units like watt-hours.
XTL@sopuli.xyz 9 months ago
Laws of physics: defeated.
spankmonkey@lemmy.world 9 months ago
If I’m misremembering the details, feel free to clarify.
CrazyLikeGollum@lemmy.world 9 months ago
The equation to determine watts is P=VA
If you have the same voltage and a higher amperage, then by definition you have a higher wattage.
spankmonkey@lemmy.world 9 months ago
Dammit, thought they all multiplied into a fourth thing.
commandar@lemmy.world 9 months ago
Wattage = V x A.
They’re pointing out that it’s impossible to hold both wattage and voltage constant while changing the amperage.