A few are those that are widely found in homes and school. But, you may be curious to know what other connectors for power are available. From IEC as well as NEMA There are many power connectors, including C20 power cords you should learn. They are typically found in homes, offices as well as data centers.
IEC connectors are either outlet or inlet connectors which use numbers. Odd numbers are the outlets while even numbers refer to the inlets. This helps you remember them easier.
NEMA connectors are different. The 1-15 outlets are common in older homes and offices. These are those with two prong connections. While the 5-15 outlets have three-prong connectors found on wall outlets that are grounded. The 5-15 outlets look very similarto the 5-20 outlets and come with three prong connectors. But, the 5-20 outlets are equipped with a vertical blade, which is able to handle more amps.
This video will provide all that you should learn about power connectors and also show which may be available in your home.