Many appliances that have motors need the correct voltage - for that you would need a converter, not just an adaptor. For most electronics there is tiny print on it somewhere that says what it will accept and if it says 100 to 240 V 50/60 Hz, all you need is an adaptor.

This label [img]https://qph.fs.quoracdn.net/main-qimg-c76295ef84c88fd72e4d7a409b8316ee-lq[/img] says that it will output 12 volts ( likely as a charger ) if plugged into an outlet that supplies anything from 100 volts to 240 volts, and will run on either 50 hz - which is what the French side has, or 60 hz, which the US uses. I have a few olders chargers for laptops that only work on 120 volt, so you will want to check the labels before you go.