An ammeter measures amperes or flow of current through the circuit.
First connect the ammeter to the electric circuit. Ammeters usually have screw connectors either at the top or at the back of it. Now, Connect the wires to the positive and negative screws and tighten it. Now you can see the reading.
Reference: http://how-to.ask.com/other/how_to_read_an_ammeter
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