Are all 9v AC adapters the same?

The UK standard power plug is different from that used in Europe, for example, and different again from the standard US plug. Most AC/DC adapters are not universal and can only be used to power compatible devices. However, some models are designed to work as replacement chargers for a wide range of devices.

What do numbers on adapter mean?

Engineers might recognize that the voltage x amps number will give you the total wattage of the charger or adapter. Again, these numbers are indicating the rate at which power is sent from the outlet to your electrical device.

Can I use a 5V 3A charger with a 5V 2A device?

No,It doesn’t affect the battery or phone. you can use 3A charger instead of 2A if that’s what you’ve got. smartphones takes only the power it needs or handles upto. so you wont see any difference between 3A charger and 2A charger if your phone can support upto 5V 2A charging.

How do I know what wattage my adapter is?

For the first, it’s as simple as looking at the charger itself. This may have the wattage printed on it (as with Apple chargers) but it might have output(s) quoted as volts and amps. For example, if it says the output is 5V at 3A, then it’s a 15W charger because Watts = Volts * Amps.

Can I use 18V adapter for 12V?

18V would be risky, I would not try to plug a 12V device into an 18V battery. But if you happen to have 18V for whatever reason, you can always use a DC-DC converter. I use car-plug type adapters for all my 12v equipment because they have fuses in them.

Will any 9V adapter work?

In most cases, you cannot use a 12V adapter to power a 9V guitar pedal. Using a 12V adapter on a pedal designed to only handle 9V can completely destroy it. There are some guitar pedals built to handle voltages higher than 9V.

How do you read a adapter?

Reading the polarity of the connector The most common is center positive (+) connectors. There is also the less popular center negative (-) connector. The adapter and the device must match so always double check the symbol on the AC adapter and the device show the same polarity.

How do I know which power adapter to use?

The right AC adapter for your device is one with matching electrical ratings. The device’s input voltage and current must match the adapter’s output voltage and current. Check the device’s product label or user manual to see its rated voltage and current.

What happens if you use the wrong power adapter?

The device could power on, and just draw more current from the adapter than it’s designed for. This could cause the adapter to overheat or fail. Or, the device may power on, but the adapter may not be able to keep up, causing the voltage to drop (see voltage too low above).