Can a phone charger charge a laptop?

Mobile phones, tablets, Kindles and other mobile devices that charge using a USB port typically support a voltage of 5V. A laptop charger can be as high as 20V- 25V. You can typically find the voltage required to charge your laptop on the machine itself, on the battery or alternatively on the manufacturers website. Failing this, a website which sells universal laptop chargers may be able to support such a request.