Got an iPad? Here's a well-illustrated article, 20-pages long, that gives details you need.
Jim Hamm informs us, "The charger for the iPad is relatively expensive at $19 if purchased from Apple. Sure, you can purchase counterfeit lookalikes for a much cheaper price. Should you? In a word, NO! The old adage 'you get what you pay for' is certainly true in this case. Here is an excellent article explaining why you should stick with the genuine Apple iPad charger."