A platinum coil has a resistance of 3.146(ohms) at 40'C and 3.767(ohms) at 100'C. Find the resistance and the temperature coefficient of resistance at 0'C. Thanks in anticipation
A. R = Ro + a(T-To)Ro.
3.146 + a(100-40)3.146 = 3.767.
3.146 + 188.8a = 3.767.
188.8a = 3.767 - 3.146 = 0.621.
a = 0.621 / 188.8 = 0.003289. = Temp, coerfficient.
B. R = 3.146 + 0.003289(0-40)3.146.
R = 3.146 - 0.4139=2.732 Ohms @ o Deg.