A comprehensive guide to choosing the right charger for your mobile device

When choosing a mobile charger, it’s important to consider two key parameters: power (in watts) and current (in amps). Understanding these parameters will help determine how quickly your device will charge.

1. Power (watts).

Power reflects the total capacity of the device. In simple terms, the higher the power of the device, the faster it can charge your device. For example, a 33 watt charger will charge faster than a 20 watt charger.

2. Amperage (A)

Amperage is an important parameter displayed on chargers. It indicates how much current the power supply can deliver to the device.

A comprehensive guide to choosing the right charger for your mobile device
"Mobile phone charging" by Rawpixel Ltd is licensed under CC BY 2.0.

To understand the power output of a charger, you need to multiply its voltage (in volts) by its current (in amps). For example, a charger with an output voltage of 5V and a current of 2A has a capacity of 10W (5V * 2A = 10W).

A high amperage allows you to charge devices that support that charge current faster. If your phone can take 3A and you use a 3A power supply, it will charge faster than if you use a 1A power supply.

Important notes:

  • If your device only supports 1A and you use a 3A power supply, the device will still only draw 1A.
  • Using a power supply with a higher amperage than the recommended amperage for your device is usually safe, as the device will only draw the current it needs. However, it is always best to follow the manufacturer’s recommendations.


Choosing the right charger is a combination of the right power and amperage for your device. Keep these parameters in mind to ensure efficient and safe charging of your mobile device.

Prepared by Mary Clair

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