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The resistivity of silver is 1.586.

The resistivity of copper is 1.678.

The resistivity of gold is 2.4.

The resistivity of aluminum is 2.6548.

Therefore, when the length and diameter of the wire are the same, the resistance of silver wire is the smallest, followed by copper;

When the DC resistance of the conductor in the motor is large, the electric power consumed by heating is large; When the motor power is constant, in order to achieve the same efficiency, the motor using aluminum conductor is much larger than that using copper conductor. Because it needs more space to accommodate thicker wires;

Therefore, using silver enameled wire with the same diameter instead of copper wire to wind the motor with the same volume can improve the power, while using gold enameled wire instead will reduce it and approach the level of aluminum wire. Of course, the cost is irrelevant.

Other things being equal, the design of the motor wound with silver wire is smaller than that wound with copper wire of the same power (the coil volume is smaller).