Dielectric means non-conductor. Dielectric grease might be used to keep moisture out or for heat transfer but it is an insulator.

Contact improver is just about the opposite. It may be metal filled, have abrasive characteristics in a lubricating vehicle.

The power current resistance relation is P=I^2 x R An electric motor will draw more current as the voltage droops, dropped across other resistors in the circuit, limiting the Counter Electro Motive Force induced in the motor. As the motor slows due to load or low voltage, the current will increase until the motor quits on overheat or a protective device functions.

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