Standard American outlets have at least two slots. The left slot is the neutral slot, and the right slot is the hot slot.

You'll notice that not all electrical plugs are the same and might even have different inserts depending on the country. Here ...

An curved arrow pointing right. Have you ever looked at your iPhone cable and then looked at your computer charger and thought, "why does one of these have 2 prongs, but the other one has 3?" ...

An curved arrow pointing right. Have you ever looked at your iPhone cable and then at your computer charger and thought, "Why does one of these have two prongs, but the other has three?" ...