The answer to 'what size outlet do I need' is that the size of the electrical outlet you need depends on the specific electrical requirements of the appliance or device you want to power. Most standard household outlets in the United States are 120-volt, 15-amp or 20-amp outlets. These can power most common household appliances like lamps, televisions, and small kitchen appliances.
If you have a larger or high-powered appliance, such as a dryer, oven, or air conditioner, you may need a 240-volt, 30-amp or 50-amp outlet. These higher-amperage outlets provide the necessary power for those types of heavy-duty appliances. It's important to check the electrical specifications of the device you want to use to ensure you have the right size outlet to safely power it.