Question

Exp lain any 2 applications of thermal effect of current

Answer 1

Polymer

The thermoplastic polymer is common in packaging and household items. For the analysis of plastic raw materials, DSC can be used to analyze the effect of additives (including stabilizers and color) and optimization the materials and manufacturing processes plasticity. For example, studies of oxidation induction time (OIT) by DSC of thermoplastics can be determined (usually a polyolefin), which antioxidant polymer stabilizer additive amount.

Metal

Metal manufacturing (cast iron, grey iron, ductile iron, compacted graphite iron, 3000 series aluminium alloys, copper alloys, silver, and complex steels) is one of the applications of thermal analysis. Liquid metal samples were removed from the furance and put into the cup with thermocouple temperature sensor embedded. The temperature is then monitored and recorded phase change diagram (liquidus, eutectic, and solidus). The phase change diagram, the chemical composition of metal castings or its crystal structure, can be calculated.

Answer 2

When a current flows through a conductor, heat energy generates in the conductor. The heating effects of electric current depend on three factors:

The resistance of the conductor. A higher resistance produces more heat.

The time for which the current flows. The longer the time the amount of heat production is high.