Why can I charge me iphone with my car's usb port but not my ipad?

Why can I charge my Iphone in my car using USB connection but not my Ipad?

Because the iPad requires a lot more power to charge than your iPhone, and typically car and computer USB ports simply don't proivide that much.
Its the same reason your iPhone comes with a 5Watt charger (and even then the iPhone only uses part of that) while the iPads come with the 10 or 12 watt charger.
They just need more power.

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