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Kymmy · 28-11-2015, 10:09

Linear transformers (old style) are inefficient (due to the way that the regulator circuit dumps the excess voltage) even when there's no current draw so yes there was loss but not really a great deal unless you're talking about 60-100 amp 12v PSU's that I regularly use (mainly for radio applications due to less interference)

Switch mode (new style) has actually been around for 40 years and 99.99999999% of PC's ever produced have used one. They are more efficient as they can turn off the circuit when no draw is detected by using an even smaller sub circuit. It's likely that for the last 20 years you've been using this type of PSU to charge your phone, run a laptop so not really newer tech.

28-11-2015, 10:09	#3
Kymmy Inactive Join Date: Dec 2007 Posts: 18,398	Re: Charger electricity use. Linear transformers (old style) are inefficient (due to the way that the regulator circuit dumps the excess voltage) even when there's no current draw so yes there was loss but not really a great deal unless you're talking about 60-100 amp 12v PSU's that I regularly use (mainly for radio applications due to less interference) Switch mode (new style) has actually been around for 40 years and 99.99999999% of PC's ever produced have used one. They are more efficient as they can turn off the circuit when no draw is detected by using an even smaller sub circuit. It's likely that for the last 20 years you've been using this type of PSU to charge your phone, run a laptop so not really newer tech.