Why is electricity visible in sparks, but invisible when its inside the wires?
A spark is not electricity. A spark is NITROGEN/OXYGEN PLASMA. Plasma is related to fire. The plasma is created when some high voltage is present. High voltage causes air molecules to be torn apart, and as they hit other molecules or fall back together, they give off light. Plasma is conductive, so once it has formed between two wires, it joins the wires together electrically, and charges can flow through it. It might SEEM as if “electricity” has jumped through the air. In reality, a glowing “wire” has formed, and this “wire” is made of plasma. We can only see the plasma jump between the ends of the wires. We cannot see the flowing charges or the electrical energy.
