A plug adapter (like the ones shown above) will allow you to use your device without the need to convert electricity, but the charger has to be rated at both voltages. If your device doesn't support dual voltages, you'll need a converter. The charger on my phone, for example, reads "Input: 100-240V AC."
Accordingly, do I need a voltage converter for my iPhone?
Yes, you can use the simple adapter. If you read the tiny fine print on the plug end you see "110-240V 50-60Hz" which means it will work on most common electrical systems around the world without a transformer. Yes, it is perfectly safe to use a simple adapter for EU. You do not need additional transformers.
What voltage to charge iPhone?
An iPhone charger delivers 5 Watts (5 volts at 1000 mA). A Retina iPad mini charger delivers 10 watts (5.1 volts at 2100 mA). While all of these will charge your iPad, using the USB connected to a PC will charge your Retina mini four times slower than if you used the iPad charger it came with.
What voltage is an iPhone 7 charger?
The iPhone 7 charging voltage level stays around 4.8 volts but as the current drawn drops, eventually rises to a little over 5 volts. The current level initially starts at .92 amps and then jumps to 1 amps.