capital comsumption

Accounting for cost - capital comsumption
Note that I use the word consumption and not investment. What do I mean by capital consumption? The purchase of an asset which wears and diminishes in value and efficiency over time is what I cal capital consumption. How should this be done? If the asset works adequately then should there be an annual maintenance charge? And if the asset obsolesces over time? Glad it’s not my problem!