using System;

namespace Science.Physics.GeneralPhysics
{
	/// <summary>
	/// Capacitance
	/// </summary>
	public class Capacitance : Scalar
	{
		public Capacitance()
		{
		}
		public Capacitance(ElectricCharge Q, ElectricPotentialDifference V)
		{
			this.Magnitude = Q.C / V.V;
		}
		public Capacitance(Area A, Length d)
		{
			this.Magnitude = Constant.PermittivityOfFreeSpace*A.mSQUARE/d.m;
		}
		private double kappa;
		public double DielectricConstant
		{
			set{kappa = value; this.Magnitude *= kappa;}
		}
		public double F
		{
			get{return this.Magnitude;}
			set{this.Magnitude = value;}
		}
		public static Capacitance Parallel(Capacitance C1, Capacitance C2)
		{
            Capacitance C = new Capacitance();
			C.F = C1.F + C2.F;
            return C;
		}
		public static Capacitance Series(Capacitance C1, Capacitance C2)
		{
            Capacitance C = new Capacitance();
            C.F = C1.F*C2.F/(C1.F+C2.F);
            return C;
		}
		public double Energy(ElectricPotentialDifference V)
		{
			return 0.5*F*V.V*V.V;
		}
		public double Reactance(Frequency f)
		{
			return 1.0/2.0/Math.PI/f.Hz/F;
		}
        public override string ToString()
        {
            return base.ToString() + "(F)";
        }
	}
}