The phrase "power drain" refers to the energy that is used up or consumed by an electronic device or machine. It means that the device is using energy from its power source and reducing its available power.
Sentences with «power drain»
An electric water pump reduces power drain from the engine. (nextgreencar.com)
Less power drain would have been assured in any of these combinations. (goodereader.com)
It also draws its power directly from the battery, eliminating the traditional, engine - power draining hydraulic steering pump. (anciranissansa.com)