For tubing there's the more specialised tool like this https://www.westlab.com.au/glass-tubing ... ium-cutter Statistics: Posted by Milo — Tue Oct 01, 2024 4:59 am ..read more

Well said Merilyn Statistics: Posted by Labbie — Mon Sep 30, 2024 2:06 am ..read more

Thank you very much bigmack and Loopy! I ended up purchasing the ones from MTA, hopefully they come in time otherwise I'll be making the resistor above! I'm very new to the whole electricity/circuit world so this helps a lot! Statistics: Posted by Nads343 — Fri Sep 27, 2024 5:18 am ..read more

Maybe a bit of both. I think we're over-cautious regarding borax, but I deplore the use of herbicides and pesticides by untrained people. The effect on biodiversity is overwhelming bad. I have my ChemCert card, and I think you should be unable to buy such toxins without one. Interestingly, when they first introduced Chemcert a million years ago, the intention was that you would not be able to purchase hazardous pesticides without having done the training. That never took off, can you imagine the influence that Bunnings has and why it never happened? Only in recent times has Bunning stopped s ..read more

Thats cunning LTB What strength Ethanol is that ? Do you use the Absolute ? Or good old Diggers Methylated spirits ? That would have been a real time saver back when we had all the covid sterilising nightmare . 70% with a tiny dash of dish detergent. I asked he wrong person when we could stop, only to be told we should have been cleaning them after every use already. Now I am stuck doing it. Statistics: Posted by LabTechBrooke — Fri Sep 27, 2024 1:17 am ..read more

I then use BBQ tongs to lift them out. It would need a few tweaks to be perfect but it has saved me lots of ethanol and time. Just make sure you avoid anything that rusts! Thats cunning LTB What strength Ethanol is that ? Do you use the Absolute ? Or good old Diggers Methylated spirits ? That would have been a real time saver back when we had all the covid sterilising nightmare . Statistics: Posted by bigmack — Fri Sep 27, 2024 12:08 am ..read more

Incidentally , using 10watt resistors , you wouldn’t actually need to use water ….. especially if you had 20 ohms @ 20 watts . However , the reason water is used is because the resistance of the resistor changes as it gets hot . By using water cooling , the resistor becomes an “Ohmic Resistor” meaning its value does not change as it gets hotter. So when the students plot voltage against current , they get a straight line graph . Also water is used to cool resistors to stop them burning out . Statistics: Posted by bigmack — Thu Sep 26, 2024 11:08 pm ..read more

Serrata are now owned by MTA . I made some water cooled resistors for my wife last year . I bought some screw lid jars from $2 shop and some banana sockets and resistors from Jaycar . EDIT : I just remembered Jaycar didn’t have enough resistors and sockets in the local store so I bought some from an old supplier I used when I fixed TVs . Anyway ,she had always used 5ohm resistors . The reason being that as the students only had 5amp meters , any higher value resistors would make current measurements too inaccurate . Any lower resistor value , and the current starts to exceed what the power p ..read more

Morning, Modern Teaching Aids bought Serrata out and have those resistors available. Statistics: Posted by Loopy — Thu Sep 26, 2024 10:50 pm ..read more

Yes it is, Our industrial dept, use to solder them, for us once a year, when year 7 first started. Ask around at your school. Statistics: Posted by Labbie — Thu Sep 26, 2024 6:04 am ..read more