A mains lead is the power cable for the strip heater. The mains lead is single-insulated.
lead
Put the black lead into any of the black connectors on the molex.put the read lead into the yellow, or red lead on the molex.
The arrow always points to the negative lead.
Normally all electrolytic capacitors negative lead is marked on the side and if the plastic cover came off and it is new the long lead is the positive.
very hard
lead is soft and copper is hard
because Lead is a very hard material
No because it is hard lead
Lead is purified from bullion using the Betts electrolytic process when lead must be highly purified. There are other methods, most of which use electrochemical processes for purification.
Lead is so dense it is as hard as rock, so it is very hard to write with them. And also, it's very toxic. Pencils now contain graphite, which is just a form of relatively harmless carbon. However, people still call them "lead".
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Hard rubber
by putting effort
No
Mild steel
Hard water contains a lot of ions , which can lead to the build up of limescale.