Give the names of four alloys along with their composition, which are used for making heater and thermocouple elements.
Constantan or Eureka {(55 to 60 percent) Cu, (45 to 40 percent)Ni}
German silver (an alloy of CU, Zn and Ni)
Manganin (86 percent Cu, 2 percent Ni, 12 percent Mn)
Nichrome (61 percent Ni, 15 percent Cr, 24 percent Fe)