The phrase "a more efficient device" is correct and usable in written English.
You can use it when comparing the efficiency of different devices, typically in a technical or product review context.
Example: "After testing several models, we found that the new model is a more efficient device for processing data."
Alternatives: "a more effective device" or "a superior device."
Individual charity might have a refining effect on the character of the donor, but poor relief from the state engendered irresponsibility in recipients while embittering those whose resources went to fund it: "There could hardly be found a more efficient device for estranging men from each other, and decreasing their fellow-feeling, than this system of state-almsgiving.
It just feels like a more efficient device with less wasted space.
A more efficient device would allow a lower dose to be administered to achieve an effective dose at the site of action but the swallowed dose would also be lower, and hence the systemic absorption.
For instance, life insurance is a substantially more efficient device; consequently, the family man who places his trust in Providence is irresponsible.
This paper proposes a new and more efficient device for energy transfer over melting ice with performance improved to produce chilled air by complete removal of melt in cool thermal discharge systems.
Furthermore, the model can be used to evaluate behavior in other integrated or discrete magnetic devices with either non-isotropic or isotropic permeability and used to produce more efficient device designs in the future.
Moving away from traditional motherboards to create all-in-one chips that include processing, memory, input/output and storage is an essential cornerstone when building ever-smaller and more efficient devices.
It is only in the recent past that gallium (Ga) and sulfur (S) were incorporated into CuInSe2 in order to increase the energy band gap of the film to an optimum value with the ultimate aim of producing more efficient devices.
