//  Electrical quantities classes -- Potential 
                                    package electric;

public class Epotential {
    double value;

public Epotential(double volts) {value = volts;}
public Epotential(Epotential x) {this(x.value);}
public Epotential()             {this(0);}

//  Epotential arithmetic operations (additive pattern)
//  --------------------------------

public Epotential  addSet(Epotential rs) {value+=rs.value; return this;}
public Epotential  subSet(Epotential rs) {value-=rs.value; return this;}
public Epotential  mpySet(double     rs) {value*=rs;       return this;}
public Epotential  divSet(double     rs) {value/=rs;       return this;}
public Epotential  modSet(double     rs) {value%=rs;       return this;}
public Epotential  modSet(Epotential rs) {value%=rs.value; return this;}

public Epotential  minus()               {return new Epotential(-value);}

public Epotential  add(Epotential rs) {return new Epotential(this).addSet(rs);}
public Epotential  sub(Epotential rs) {return new Epotential(this).subSet(rs);}
public Epotential  mpy(double     rs) {return new Epotential(this).mpySet(rs);}
public Epotential  div(double     rs) {return new Epotential(this).divSet(rs);}
public double      div(Epotential rs) {return value / rs.value;}
public Epotential  mod(double     rs) {return new Epotential(this).modSet(rs);}
public Epotential  mod(Epotential rs) {return new Epotential(this).modSet(rs);}

public boolean     equals     (Epotential rs) {return value==rs.value;}
public boolean     lessThan   (Epotential rs) {return value <rs.value;}
public boolean     greaterThan(Epotential rs) {return value >=rs.value;}

// Mixed arithmetic operations

public Epower      mpy(Ecurrent i) {return    new Epower(value*i.value);}
public Eresistance div(Ecurrent i) {return    new Eresistance(value/i.value);}
public Ecurrent    div(Eresistance r) {return new Ecurrent(value/r.value);}

//  Conversion to external representation

public String toString() {return value + " volts";}
}