Recent content by mark g

Hi. I am looking to understand the difference primarily in construction between a wirewound resistor and an inductor. Both are formed using a coil loop but are clearly behaving differently. Does the coil in a wirewound resistor induce a magnetic field?? Thanks, Mark.

Something like the pic above except threaded on both ends so I can attach a nut. Something around the M4 size Would be perfect.

Hi All. I am not sure if this is the right section for this but I will ask anyway. I am looking for a bolt that pivots midway like a hinge. I have seen them before but I don't know what they are called and cannot find any on-line. Alternatively does anyone know of a pivoting pipe? Can anyone...

Thanks for all your replies folks. I was thinking about it the wrong way. Cheers, Mark.

Apologies for my typo above. I meant to say "A capacitor will resist changes in Voltage" It will pass high frequency ac but resist changes in voltage. This does not make sense to me. With a high frequency signal the voltage is changing constantly. Does it mean the peak to peak Voltage??

Hi Folks. I am having trouble comprehending this and sounds like a contradiction. A capacitor will resist changes in current. A capacitor will pass high frequency ac. With a higher frequency alternating current the voltage is constantly changing so how is this possible if it resists change in...

Hi Dave. That's what I thought. But say for example you are lying down with your phone or the radio aerial is at a funny angle the signal is ok. How is this? Would it be that the signal is in fact weaker and that the device just up's the power? Mark.

Hi Guys. Thanks for the responses. I can visualise it much better now. I still have a bit of an issue with the received signal. I have attached an image which has two parts. I the first part (top half) the receive antenna will receive the transmitted signal (-free space path loss)...

Hi. I am having trouble visualising radio waves. Assuming a perfect isotropic antenna (I know they don't exist) an electromagnetic is just a spherical pulse that radiates outward, this is quiet easy to visualise. However all texts refer to the magnetic and electric fields being 90 degrees...

Hi all. This question has been bugging me for a while now so hopefully you can help. I want to know how an electrical load (such as a motor) maintains its power, like when the voltage drops the current increases. I know all the formulas ( in this case P = V x I ) but want to know how it...