As the diameter of a wire increases, what happens to resistance and amperage?

When the diameter of a wire increases, the resistance of the wire decreases. This is because resistance is inversely proportional to the cross-sectional area of the conductor; a larger diameter means a greater area for the flow of electric current, which reduces the opposition to the flow of electrons.

As for amperage, according to Ohm's Law (V = I * R), if the voltage remains constant, a decrease in resistance will result in an increase in current (amperage). Therefore, an increase in wire diameter leads to a decrease in resistance and an increase in amperage when the voltage stays the same.

This interaction of resistance and amperage with wire diameter is a fundamental concept in electrical engineering and circuits, illustrating how physical properties of materials can influence electrical behavior.