Need a small favor-Measuring Resistance

Thread Starter

ISB123

Joined May 21, 2014
1,236
Hello,I tried measuring resistance of lead refill tip but I'm unable to get a stable reading.I measured 5Ω for a brief moment before it went crazy again so I'm unsure of its value and google isn't providing much information.

So can anyone try measuring one for me if they got some free time?
Thanks!

PS
Managed to measure it,they have 2.5Ω.
 
Last edited:

GopherT

Joined Nov 23, 2012
8,012
Hello,I tried measuring resistance of lead refill tip but I'm unable to get a stable reading.I measured 5Ω for a brief moment before it went crazy again so I'm unsure of its value and google isn't providing much information.

So can anyone try measuring one for me if they got some free time?
Thanks!

PS
Managed to measure it,they have 2.5Ω.
You need a diameter and a length to go with it. For example, 2.5 ohms for 0.7mm diameter lead and 1 cm gap.

Also, don't expect it to be constant across all lead refills. Some have more graphite and some have more hardener/binder. The lead refills are not "naturally mined graphite", they are compressed and extruded graphite. Various hardness - usually from 6H to 2B.
 
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