# What does the specification chargers usually mean like Output: 5V=2A or 5V=6A MAX ?

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I was looking at my One Plus Warp charger and I saw that the output says 2A or 6A at 5V. What does this exactly mean?

Edit: I wanted to add some more info. When I charge my brother’s mi phone(screen displays fast charging when I use mi charger at 5V and 3A) from my charger it doesn’t show fast charging. So does the warp charger operate at 3A when it is charging the mi phone or at 2A?

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The V rating describes the voltage. For most systems, this should *perfectly* match the rating of the thing you charge. If your phone charges at five volts, you want a 5v charger.

The Amp rating is a limit. Your device should not exceed the charger’s maximum amperage (current). Most devices, like phones, will automatically adjust and so it is not an issue. Something like a computer monitor, however, may not be designed to do so, and so you must be more careful when choosing a power cable for such a device.

No expert but I think it means it can operate at two modes. One being the lower 2 amps at 5 volts (10 watts) and the higher 6 amps at 5 volts (30 watts). Not every battery can handle 30 watts it can damage the battery so I believe the lower mode is to protect the battery by charging slower.

I believe watts (actual energy) is determined by multiplying volts times amps. But I really don’t remember so take this with a grain of salt

Isn’t it 15V at 2Amps or 5V at 6Amps?

Very simple it means that the power supply is putting out a 5 volt supply and it can provide either 2 amps or 6 amps output at 5 volts.

I’m guessing that the adapter either has a switch to swap between the 2 ampages, or the higher ampage is only available to items that have the circuitry to enable the higher current draw

Modern USB allows the device being charged and the charger to talk to one another, which they use to agree on how much power to deliver.

Those numbers list the power delivery modes supported by the charger. The ”=“ symbols actually means “Direct Current (DC)”, as opposed to “~” “Alternating Current (AC)”.

So when you plug your phone in the charger will advertise that it can provide 5V @ 2A (10Watts) _or_ 5V @ 6A (30W), and your phone will request the one it wants.

My laptop has a 96W USB Type-C charger which advertises the same power delivery as yours _and_ 15V @ 5A (75W) and 20V @ 4.8A (96W), and a few in between.

So you see, the USB Power Delivery specification allows a wide range. Your charger says which it supports. It’s options happen to both use 5V and are at the lower end of the range.