How to assemble a circuit with a relay that turns on from a 5-volt network and closes a 12-volt one?

Question

Electronics

There is a wire for charging iPhone. I want to insert a relay into the wire so that when the iPhone is connected to it, the 12-volt network closes.
I don't understand anything about these things, I will be glad if someone can help design the circuit.

Answer 1

Relay control

Answer 2

You can take a current relay and stupidly insert it into a wire cut. When current flows through the wire, the relay is activated. True, if the iphone is charged, then the relay will turn off
. Something like this , only for direct current and more compact, perhaps

Answer 3

"I don't understand anything about these things" write how much you are willing to pay. I will not work with you 146%.