Your comment is kind of misleading. Having a transformer is kind of irrelevant. The truth of the statement is anything that creates heat in direct use of the appliance. So yeah, hair dryers, kettles, shit like that. A transformer just changes voltage, and the power supplies you mentioned aren’t even referred to as “transformers”. They’re actually switch mode power supplies. They have small transformers in them, but that’s not the primary component of the device either.