Electrical outlet types

There are many types of outlets. Most important classification of outlets is by voltage and amperage they are suited for. By these features there are four main types of outlets:

In US the most widely used type of outlets is 120 V, 15 Amp, although some electric devices require outlets for higher voltage and/or higher amperage. These requirements are usually linked with power consumption of electrical devices. Since lights use little power, they can safely be on 120V 15A outlet, while power-consuming devices as an electrical heater may require outlet with higher amperage or/and voltage to work safely.