hope you can help?

[123sparkingmad]

Hi hope I can get some guildance on a question that I'm not 100% sure on

The meaured resistance value of a short length of 2.5 sq. mm conductor would be?

a. infinity
b. in the M resistance range
c. very low ohms
D. zero volts

I put C but I was hoping someone could explain it for me thanks

 

[Paul_C]

Answer C is correct.

a. infinity

Infinity is an open circuit.

b. in the M resistance range

Presumably that's meant to be megohms. A short length (or even a very long length) of 2.5 sq. mm copper conductor is not going to have a resistance in the megohm range.

D. zero volts

The "red herring" answer, in a way, since of course volts are the unit used to measure voltage, not resistance.

 

[123sparkingmad]

Thanks for simplifing that for me, thats a great help.

 

[WabbitPoo]

Jeepers - I hope that's not a sparky student!

 

[EFLImpudence]

The meaured resistance value of a short length of 2.5 sq. mm conductor would be?
c. very low ohms

It is 7.41 mΩ/m (milliohms per metre)

I put C

Where?

 

[ban-all-sheds]

Jeepers - I hope that's not a sparky student!

I fear it may be.

The new academic year started a few weeks ago.

123 - if you are a student, and you are being asked questions which you do not understand, or to which you do not know the answers, then coming here to ask other people to answer them for you is not on.

Not only is it dishonest, but it also gives your tutors a false impression of your progress.

If you are struggling, and need them to explain things differently, or again, or better, then they need to know that, which they won't if you mask it by presenting other people's answers as your own.

I realise that in this case you didn't actually ask for an answer, but the same principle applies - if you don't know why the measured resistance value of a short length of 2.5 sq. mm conductor would not be 0v, or ∞, or in the MΩ range then they need to know that. Pretending to them that you understand will only ever lead to you crashing and burning.

 

[JohnW2]

Jeepers - I hope that's not a sparky student!

I fear it is. The new academic year started a few weeks ago.

Wouldn't (s)he be 'qualified' by now if the course started a few weeks ago?

Kind Regards, John.

 

[PrenticeBoyofDerry]

Hi hope I can get some guildance on a question that I'm not 100% sure on

The meaured resistance value of a short length of 2.5 sq. mm conductor would be?

a. infinity
b. in the M resistance range
c. very low ohms
D. zero volts

I put C but I was hoping someone could explain it for me thanks

When measuring resistance, using low reading ohm meter. That is what you are generally looking for a low reading.
A calculated reading of 7.41 mΩ/m (milliohms per metre) is given in the OSG.
If you measured end to end continuity of any of the conductors on a 2.5mm t&e cable over the distance of say one meter. The reading I would expect is somewhere very close to zero, you would also expect over a longer distance that the CPC would measure slightly higher due to the fact it's CSA is smaller than the live conductors.

 

[bernardgreen]

Jeepers - I hope that's not a sparky student!

I fear it is. The new academic year started a few weeks ago.

Wouldn't (s)he be 'qualified' by now if the course started a few weeks ago?

Kind Regards, John.

Maybe it was a question in the end of course examination.