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Can you have more amps than required?
As the article states, you do want to match voltages between the power supply and device, but you can us a power supply with more amps than needed. The device will only draw as much current (Amps) as it needs at the time.
Can I use a 2 amp charger for a 1.5 Amp device?
Yes, it is absolutely safe to charge a device with a charger that has more current capacity than needed. Since the voltage is held constant (5V), the only factor that determines current draw is the load (another term for resistance) the device places on the charger.
What happens if there is a power mismatch?
For the current mismatch, back to the simple Ohm’s law that indicates: Extreme current can destroy both passive and active components due to overheating caused in device components, where low current based on power law: will requires more voltage to provide the needed power to operate, which could cause a damage as mentioned above.
Can you plug in power adapter with mismatched current rating?
However, plugging in a power adaptor with mismatched current rating will not. In most cases this is true, but not always. If the power adapter is unregulated and/or is designed to limit current (eg. for charging a battery) then its output voltage at lower current may be much higher than the nameplate rating.
What happens if you plug in an extreme current power adaptor?
Extreme current can destroy both passive and active components due to overheating caused in device components, where low current based on power law: will requires more voltage to provide the needed power to operate, which could cause a damage as mentioned above. However, plugging in a power adaptor with mismatched current rating will not.
What happens when a power adapter is unregulated?
If the power adapter is unregulated and/or is designed to limit current (eg. for charging a battery) then its output voltage at lower current may be much higher than the nameplate rating. Devices that are designed to be powered from an unregulated adapter can usually tolerate some over-voltage because they expect it.