Recent content by sophiecentaur

I would say that, without the g field there will be no 'restoring force' so there will be no oscillation. (A different problem.)

Well - there you go. A very good reason not to include inertia in Physics teaching. Otoh, if a student brings up the word there it can be dealt with appropriately, stressing that it's not a term that's used today, for good reasons. There's a very suitable analogy with the reaction of an...

Cleaning the contact face or examining for distortion could reveal any obvious problem. Also, changing the connector for a new one or, as I already commented, try a soldered version. A thorough internet search (AI) for work on the problem of connection to a circuit board could be good value...

You need to intermpret what that shows you. Massive 'bumps' in the trace may have no affect at all then they are short and 'balanced' by other bumps; in fact you'd need to look at the effect of those bumps in isolation when passing the sort of pulses you intend to be using.

The word 'resistance' has an implication of energy loss - as in electrical and frictional resistance. If you really want to use a form of words then why not 'reaction' (like Sir Isaac). But, seriously, this is really not a physics thread. It's semantics. Physics and Engineering get along fine...

This is a crucial point. SMA connectors have a long history and have a wide range of applicable frequencies. SMA is very convenient as a connector because it's small and handy to fit into situations. SMA has been produced for many years and started with a maximum usable frequency of 12GHz but...

It's possible that the solderless type connection is just not up to the spec that's really needed. Pictures I see of SMA connectors on circuit boards all seem to used soldered connectors so that may be a 'message' about screwed types. There are many versions of RF connectors which are cheaper...

Why should it? The emission process is ended once the radiated photons have left the surface, they just keep going till they hit something (air molecule or solid surface). Up, down or sideways, the radiation process is the same. But of course, absorption of heat from surroundings will depend on...

OK. Is this different from the results of under sampling that we all know and love? I imagine that this is an issue is that there is a limited length of time available for a frequency sweep of the S parameters and that results in under sampling in the frequency domain, which results, after the...

Yes, basically. A Field (vector) is just one way of describing the variation of Potential Energy (scalar) in space. E = dV/dr in one dimension. The Force is the product of the Field and the charge (other combinations exist - like weight, field and mass)

I have recently noticed the term "causality" used in items about component with multiple transmission lines. In my past experience, the term 'Group Delay' seems to have been used as a measure of the behaviour of pulse signals in a circuit. For instance,video circuit performance used graphs of...

I was born yesterday! But, as with all Engineering, it all has to do with cost benefit and practicality. Low current conductors are cheap so you can throw just a little money at the LED circuit and keep the brightness variation as low as you need. BTW how does the overall voltage reduction...

Got it - thanks. The cost of copper in a ring main is very relevant (power dissipation costs you). Thin lighting wire is cheap so you can afford to ‘waste’ the extra current carrying capacity in the interest of even lighting. Smart!

Could you clarify this a bit more, please? If you could refer to a diagram of the LED strip arrangement then It could be clear but I would assume that there's parallel connection for each LED unit onto the power leads. The ring main uses a Live ring and a neutral ring. Will a ring supply to a...

And so the UK RingMain idea was born for domestic supplies in UK homes.