Pot metal the caster adds other metals to the mix to strengthen the cast part, improve flow of the molten metal, or to reduce cost. With a low melting point of 419 °C (786 °F), zinc is often alloyed with other metals including lead, tin, aluminium, and copper. Pot metal is generally used for parts that are not subject to high stresses or torque. Items created from pot metal include toys, furniture fittings, tool parts, electronics components, automotive parts, inexpensive jewelry and improvised weaponry. It is also used in inexpensive electric guitars and other budget priced musical instruments. Pot metal Pot metal
Constant phase element Constant phase element A constant phase element is an equivalent electrical circuit component that models the behaviour of a double layer, that is an imperfect capacitor. Constant phase elements are also used in equivalent circuit modelling and data fitting of electrochemical impedance spectroscopy data. A constant phase element also appears currently in modeling the behaviour of the imperfect dielectrics. The generalization in the fields of imperfect electrical resistances, capacitances and inductances leads to the general "Phasance" concept: http://fr.scribd.com/doc/71923015/The-Phasance-Concept The electrical impedance can be calculated: where the CPE admittance is: formula_2 and Q and n (0<n<1) are frequency independent. Q =