I currently have an Inspiron laptop around five years old and the AC power adaptor is rated at 45W. I am looking to purchase a Precision laptop replacement but shocked to discover the rating has shot up to 130W. I also notice the new Inspiron laptops are now sold with a 130W adaptor.

What has happened? As a rule I always keep my laptop plugged in and this becomes a necessity when the battery eventually gives out after a few years. A couple of years ago I would not have baulked at this but electricity is expensive now!