I have a few loose heater cartridges without identification so I don't know their voltage or wattage rating. Can someone tell me how to test for these? I assume I will hook up a multimeter to the leads and look for some resistance value but I haven't been able to find the settings to use. Thank you in advance or any help. https://reprap.org/forum/read.php?1,854362,854362#msg-854362 Thu, 13 Aug 2026 20:12:17 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,854362,854807#msg-854807 https://reprap.org/forum/read.php?1,854362,854807#msg-854807 Diggrr General Sun, 09 Jun 2019 06:39:32 -0400 https://reprap.org/forum/read.php?1,854362,854394#msg-854394 https://reprap.org/forum/read.php?1,854362,854394#msg-854394 Garry Bartsch General Sun, 02 Jun 2019 15:54:52 -0400 https://reprap.org/forum/read.php?1,854362,854374#msg-854374 https://reprap.org/forum/read.php?1,854362,854374#msg-854374
Power = (Voltage Squared) / (Resistance)

Idris]]> Moriquendi General Sun, 02 Jun 2019 04:41:52 -0400 https://reprap.org/forum/read.php?1,854362,854363#msg-854363 https://reprap.org/forum/read.php?1,854362,854363#msg-854363 Then you can plug in the number to an online calculator like [rapid tables]. You can guess at voltage of 12 or 24 to get a reasonable wattage around 30-40 watts (which most rep rap heaters are).

Edit: You need two numbers entered to hit calculate and get a result, the others can remain blank.

Example: Say I measured 14.4 Ohms. If I plug in 12V to the calculator, that would be a 10 watt heater (likely not correct). But at 24V it's a 40 watt (correct).]]> Diggrr General Sat, 01 Jun 2019 23:18:03 -0400 https://reprap.org/forum/read.php?1,854362,854362#msg-854362 https://reprap.org/forum/read.php?1,854362,854362#msg-854362
Thank you in advance or any help.]]> Garry Bartsch General Sat, 01 Jun 2019 22:15:55 -0400