Hi all. I have never joined a forum of any kind before so please bear with me if I ask what appear to be silly questions. It is not immediately apparent just how one posts so I hope I've got it right. I am a retired professional photographer who has always enjoyed fixing things (computers, cameras electronics etc.) but have only a very basic knowledge concerning "real" electricity and all it's foibles. I can and have changed light fittings and wall sockets quite cheerfully but I have questions concerning the niggling little things. My question for today is what is the difference between a charger and a power supply? The reason I ask is the charger for the wife's hand held vacuum cleaner has given up the ghost and, on examining it, it says on the label 'Power supply/Charger 24v 150 ma output. To replace it from the manufacturer the price is an eye watering £25.00 whereas Maplins sell lots with roughly the same output for approx. £9.00. Does the ma output really matter in this case? Sorry for being so long winded but as I have said this is all very new for me. Any help would be greatly appreciated.