Recent content by SUDOnym

@meBigGuy thanks for your point about connector compatibility... Below is a link to the radio in question: http://www.currys.co.uk/gbuk/audio/radios/radios/logik-l2dab12-portable-dab-radio-black-12231237-pdt.html I'd be very grateful for you to advise if you can tell from the information in...

Would you mind just clarifying what that means?! Where will one be able to find this reference?

Oh wait, looking at this comment as well I am getting the impression that the INPUT and OUTPUT voltages must indeed be matched and the only mismatch can be current... but would be grateful for confirmation on this and perhaps a little theoretical discussion that would help me understand why...

Thanks for all the posts. Just to be clear then, are you saying that the second adapter I was looking at which had OUTPUT 9V -- 1A would not be suitable for my radio which requires INPUT 5.9V 0.8A because in this case there is a mismatch between the two voltages? (ie. is it only OK to have a...

Thanks for all comments. To clarify the radio can run from either DC mains adapter or it can have batteries... I don't know exactly what happens when for example batteries are inserted and the mains DC adapter is plugged in at the same time.. Would the radio draw power from batteries or the DC...

Hi there I recently lost the adapter for my radio. On the back of my radio, it says "INPUT: DC 5.9V --- 0.8A". So I am guessing I need an adapter that has an OUTPUT of DC 5.9V and 0.8A to match... . The only problem is having done a quick search online, the closest adapter I can find has an...

Hello I am a new science teacher (specialising in physics). Could I suggest starting a new forum/channel for physics teachers to discuss effective pedagogies/good practicals/demos/etc.? I for one would find that most helpful!

oh right... is it C then?

Thanks... are you sure that's the answer here... I was thinking it might be either C or D...

Hi there I am a physics teacher but also teach all sciences up to age 13. Have encountered an mcq on rocks (that I am teaching to a class of 11 year olds (year 7))which I cannot answer: A sedimentary rock has very small grains. Which statement is true? A The grains were deposited by...

Oh if only I had the time! Thanks for your help.

thanks for the information. The only thing I would question about the solar spectrum image you have linked is that this in itself is not enough - as I understand that the amount the skin absorbs is highly wavelength dependent - so to be sure that 50% is due to UV and IR we would also need to...

Hello I asked a question about infrared and UV a while back for which I got some very informative responses: https://www.physicsforums.com/showthread.php?t=676881 This is in a sense a very short follow up question: Is the reason that we don't feel 'heat' from an infrared remote...

Hello I am preparing a lesson on refraction and I've come across a confusing point. In a book I have read, it was said that the optical density of a material is proportional to the refractive index. That is, the greater the optical density, the greater the refractive index. I have however...

Hello My association with a University is coming to an end and with it ends my free access to a panoply of research journals. Can anyone suggest how someone without University affiliations (and who is unable to pay the fee for private use!) could go about accessing at least some journals/...