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Why is the ammeter reading increased when a thicker wire of the same material and of the same length is used in the circuit?

Dear student !! Electrons flow or charge flow becomes easy when the cross section area is increased and therefore more amount of current can flow that is why the reading in ammeter increases when we take a thick wire of same length......
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The resistance offered by a wire to the flow of electrons is directly proportional to the area of cross section of the wire.So when we use a thicker wire the resistance decreases and the flow of current increases in the direction opposite to the flow of electrons.Thus the ammeter, which is used to measure the current in a circuit shows a higher reading. 
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Because we know that resistance is inversely proportional to its area of cross section .so,if wire is thicker than than resistance will be decreased and the reading of ammeter will be increased
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