Added Calculations:

Temperature on changed Resistance
Resistance on Changed Temperature

Electric/ResistanceTemperatureChange.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Calculations.Electric
+{
+	/// <summary>
+	/// Calculations of temperature versus change in conductor resistance and vice versa
+	/// </summary>
+	public class ResistanceTemperatureChange
+	{
+		/// <summary>
+		/// Calculate new Temperature of Start Temperature, Start Resistance, End Resistance and Material Temperature Coeficient of Resistance
+		/// </summary>
+		/// <param name="StarTemperature">Temperature on First Resistance</param>
+		/// <param name="StartResistance">First Resistance</param>
+		/// <param name="EndResistance">Resistance after Resistance Change</param>
+		/// <param name="MaterialCoeficient">Material Temperature Coeficient of Resistance</param>
+		/// <returns>Wire Temperature on Changed Resistance</returns>
+		public static decimal EndTemperature(decimal StarTemperature, decimal StartResistance, decimal EndResistance, decimal MaterialCoeficient)
+		{
+			return ((EndResistance - StartResistance) / (StartResistance * MaterialCoeficient)) + StarTemperature;
+		}
+
+		/// <summary>
+		/// Calculate new Resistance of Start Temperature, Start Resistance, End Temperature and Material Temperature Coeficient of Resistance
+		/// </summary>
+		/// <param name="StartTemperature">Temperature on First Resistance</param>
+		/// <param name="StartResistance">First Resistance</param>
+		/// <param name="EndTemperature">Temperature after Temperature Changed</param>
+		/// <param name="MaterialCoeficient">Material Temperature Coeficient of Resistance</param>
+		/// <returns>Wire Resistance on changed Temperature</returns>
+		public static decimal ResistanceChange(decimal StartTemperature, decimal StartResistance, decimal EndTemperature, decimal MaterialCoeficient)
+		{
+			return (StartResistance * MaterialCoeficient * (EndTemperature - StartTemperature)) + StartResistance;
+		}
+
+	}
+}

Electric/TemperatureResistivityCoefficient.cs

@@ -12,6 +12,7 @@ namespace Calculations.Electric
 	/// </summary>
 	public class TemperatureResistivityCoefficient
 	{
+
 		public static decimal Aluminium = 4.9E-3m;
 		public static decimal Brass50 = 2E-3m;
 		public static decimal Brass99 = 7E-3m;
@@ -29,15 +30,5 @@ namespace Calculations.Electric
 		public static decimal Tin = 4.2E-3m;
 		public static decimal Wolfram = 4.1E-3m;
 
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 	}
 }