Why we use different size of wire sizes and quantities for different applicants?

Question

So basically I’ve looked at the wiring of some bulbs and other applicants around me and I’ve observed that some applicants have just two thin wires connected to it some have 10 thin wires, other have two thick wires etc etc.. what are the differences basically?

In: Engineering

Answer 1

Wire size, more specifically its diameter, determines how much current the wire can carry before it heats up too much and melts. An LED draws very little current, so very thin wires are sufficient. A hair dryers draws quite a bit of current, so requires much thicker wire.