What Is a Shunt Resistor?

I consider your unsolicited wisdom to be badly worded and highly misleading .

A resistor can't measure anything. It would be better written as 'it allows measurement of a voltage across a known resistance', but technically even that is incorrect because your calculation doesn't take account of the resi stance of the ammeter in parallel with it.

...Albert Wilson is a spamming c*nt?

;-)

Tim

And apparently can't spell his own surname! ;-)

Chris

Ohm my God!

Really? Have you spoken to Mr Wheatstone about that?

measurement of a voltage across a known resistance', but technically even that is incorrect because your calculation doesn't take account of the resistance of the ammeter in parallel with it.

Wouldn't that be, 'the input impedance of the volt meter in parallel with it'?

Cheers, T i m

A bridge too far...

:-)

Chris

It doesn't say it does.

Pointless change.

Divide & conquer, say I.

Given that he died in 1875, so to do would require an entirely different type of instrument; however I'm sure that he would concede that the balanced state of his bridge must be measured by a meter.

That's the way I read it, in what I consider a very misleading and unenlightening definition.

Well no the galvanometer is not used to measure anything it simply indicates that no current is flowing. The galvanometer does not do the measurement. The measurement is performed using the potentiometer, which is a resistor, originally a resistance wire and a knife edge. But it's nice to see you wriggle.

As the Bishop said to the Pole Dancer.

The term galvanometer refers primarily to an ammeter, a Wheatstone bridge u ses a voltmeter.

You can't read voltage just by looking at two points in a circuit, you need an instrument, therefore it is the instrument that is doing the measuring. The type of potentiometer you describe cannot have any credible calibration , so once it balances the bridge, its own resistance would need to be verif ied by another measuring instrument, making it pointless other than for dem onstrating a proof of concept. A switched resistor network must be used.

Care to explain the difference between the design of an ammeter and voltmeter?

In message , "Dave Plowman (News)" writes

In the case of all the meters I have used, from Avo's to the digital one I use now, it seems to be something to do with the switch on the front. ;-)

You can & almost always did make a Wheatstone bridge with a galvanometer, adding an extra resistor just reduces the sensitivity

The absolute resistance is fairly irrelevant, you just need to make the wire consistent.

Which switches in a shunt resistor. ;-)

All conventional moving coil etc meters measure current. Which is why the movement will give the FSD somewhere in mA.