Electric dryer outlets are 30-amp, 240-volt receptacles that are designed specifically for electric dryer connections. A common mistake people make is to use a range cord, which has a totally different configuration. Range outlets are actually rated for 50 amps and feature two blades at a 45 degree angle and one straight blade for the ground connection.
This is quite different from the dryer outlet that has two blades at a 45 degree angle and an L-shaped blade for the ground connection. Because they are both 240-volt outlets, they both have two hot feeds.
Newer dryer outlets come standard with four connection points. Two are hot feeds, one is a neutral, and the other is a ground connection. This has two straight blades for the hot feeds, a blade bent like an "L" for the neutral, and a round blade for the ground connection. Do you know how to connect a dryer outlet?