ElectricalResistance.java
package org.djunits.quantity;
import org.djunits.quantity.def.Quantity;
import org.djunits.unit.AbstractUnit;
import org.djunits.unit.UnitRuntimeException;
import org.djunits.unit.Unitless;
import org.djunits.unit.Units;
import org.djunits.unit.scale.IdentityScale;
import org.djunits.unit.scale.LinearScale;
import org.djunits.unit.scale.Scale;
import org.djunits.unit.si.SIUnit;
import org.djunits.unit.system.UnitSystem;
/**
* Electrical resistence measures the opposition to the flow of an electric current, and is expressed in ohm. Its reciprocal
* quantity is electrical conductance (expressed in siemens).
* <p>
* Copyright (c) 2025-2026 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See
* for project information <a href="https://djunits.org" target="_blank">https://djunits.org</a>. The DJUNITS project is
* distributed under a <a href="https://djunits.org/docs/license.html" target="_blank">three-clause BSD-style license</a>.
* @author Alexander Verbraeck
*/
public class ElectricalResistance extends Quantity<ElectricalResistance, ElectricalResistance.Unit>
{
/** Constant with value zero. */
public static final ElectricalResistance ZERO = ElectricalResistance.ofSi(0.0);
/** Constant with value one. */
public static final ElectricalResistance ONE = ElectricalResistance.ofSi(1.0);
/** Constant with value NaN. */
@SuppressWarnings("checkstyle:constantname")
public static final ElectricalResistance NaN = ElectricalResistance.ofSi(Double.NaN);
/** Constant with value POSITIVE_INFINITY. */
public static final ElectricalResistance POSITIVE_INFINITY = ElectricalResistance.ofSi(Double.POSITIVE_INFINITY);
/** Constant with value NEGATIVE_INFINITY. */
public static final ElectricalResistance NEGATIVE_INFINITY = ElectricalResistance.ofSi(Double.NEGATIVE_INFINITY);
/** Constant with value MAX_VALUE. */
public static final ElectricalResistance POS_MAXVALUE = ElectricalResistance.ofSi(Double.MAX_VALUE);
/** Constant with value -MAX_VALUE. */
public static final ElectricalResistance NEG_MAXVALUE = ElectricalResistance.ofSi(-Double.MAX_VALUE);
/** */
private static final long serialVersionUID = 600L;
/**
* Instantiate a ElectricalResistance quantity with a unit.
* @param value the value, expressed in the unit
* @param unit the unit in which the value is expressed
*/
public ElectricalResistance(final double value, final ElectricalResistance.Unit unit)
{
super(value, unit);
}
/**
* Instantiate a ElectricalResistance quantity with a unit, expressed as a String.
* @param value the value, expressed in the unit
* @param abbreviation the String abbreviation of the unit in which the value is expressed
*/
public ElectricalResistance(final double value, final String abbreviation)
{
this(value, Units.resolve(ElectricalResistance.Unit.class, abbreviation));
}
/**
* Construct ElectricalResistance quantity.
* @param value Scalar from which to construct this instance
*/
public ElectricalResistance(final ElectricalResistance value)
{
super(value.si(), ElectricalResistance.Unit.SI);
setDisplayUnit(value.getDisplayUnit());
}
/**
* Return a ElectricalResistance instance based on an SI value.
* @param si the si value
* @return the ElectricalResistance instance based on an SI value
*/
public static ElectricalResistance ofSi(final double si)
{
return new ElectricalResistance(si, ElectricalResistance.Unit.SI);
}
@Override
public ElectricalResistance instantiate(final double si)
{
return ofSi(si);
}
@Override
public SIUnit siUnit()
{
return ElectricalResistance.Unit.SI_UNIT;
}
/**
* Returns a ElectricalResistance representation of a textual representation of a value with a unit. The String
* representation that can be parsed is the double value in the unit, followed by a localized or English abbreviation of the
* unit. Spaces are allowed, but not required, between the value and the unit.
* @param text the textual representation to parse into a ElectricalResistance
* @return the Scalar representation of the value in its unit
* @throws IllegalArgumentException when the text cannot be parsed
* @throws NullPointerException when the text argument is null
*/
public static ElectricalResistance valueOf(final String text)
{
return Quantity.valueOf(text, ZERO);
}
/**
* Returns a ElectricalResistance based on a value and the textual representation of the unit, which can be localized.
* @param value the value to use
* @param unitString the textual representation of the unit
* @return the Scalar representation of the value in its unit
* @throws IllegalArgumentException when the unit cannot be parsed or is incorrect
* @throws NullPointerException when the unitString argument is null
*/
public static ElectricalResistance of(final double value, final String unitString)
{
return Quantity.of(value, unitString, ZERO);
}
/**
* Calculate the division of ElectricalResistance and ElectricalResistance, which results in a Dimensionless quantity.
* @param v quantity
* @return quantity as a division of ElectricalResistance and ElectricalResistance
*/
public final Dimensionless divide(final ElectricalResistance v)
{
return new Dimensionless(this.si() / v.si(), Unitless.BASE);
}
/**
* Calculate the multiplication of ElectricalResistance and ElectricalConductance, which results in a Dimensionless scalar.
* @param v scalar
* @return scalar as a multiplication of ElectricalResistance and ElectricalConductance
*/
public final Dimensionless multiply(final ElectricalConductance v)
{
return new Dimensionless(this.si() * v.si(), Unitless.BASE);
}
/**
* Calculate the multiplication of ElectricalResistance and ElectricCurrent, which results in a ElectricPotential scalar.
* @param v scalar
* @return scalar as a multiplication of ElectricalResistance and ElectricCurrent
*/
public final ElectricPotential multiply(final ElectricCurrent v)
{
return new ElectricPotential(this.si() * v.si(), ElectricPotential.Unit.SI);
}
/**
* Calculate the multiplication of ElectricalResistance and Duration, which results in a ElectricalInductance scalar.
* @param v scalar
* @return scalar as a multiplication of ElectricalResistance and Duration
*/
public final ElectricalInductance multiply(final Duration v)
{
return new ElectricalInductance(this.si() * v.si(), ElectricalInductance.Unit.SI);
}
@Override
public ElectricalConductance reciprocal()
{
return ElectricalConductance.ofSi(1.0 / this.si());
}
/******************************************************************************************************/
/********************************************** UNIT CLASS ********************************************/
/******************************************************************************************************/
/**
* ElectricalResistance.Unit encodes the opposition to the flow of electric current.
* <p>
* Copyright (c) 2025-2026 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved.
* See for project information <a href="https://djunits.org" target="_blank">https://djunits.org</a>. The DJUNITS project is
* distributed under a <a href="https://djunits.org/docs/license.html" target="_blank">three-clause BSD-style license</a>.
* @author Alexander Verbraeck
*/
@SuppressWarnings("checkstyle:constantname")
public static class Unit extends AbstractUnit<ElectricalResistance.Unit, ElectricalResistance>
{
/** The dimensions of the electrical resistance: kgm2/s3A2. */
public static final SIUnit SI_UNIT = SIUnit.of("kgm2/s3A2");
/** Ohm. */
public static final ElectricalResistance.Unit ohm =
new ElectricalResistance.Unit("ohm", "\u03A9", "ohm", IdentityScale.SCALE, UnitSystem.SI_DERIVED);
/** The SI or BASE unit. */
public static final ElectricalResistance.Unit SI = ohm.generateSiPrefixes(false, false);
/** micro-ohm. */
public static final ElectricalResistance.Unit muohm = Units.resolve(ElectricalResistance.Unit.class, "muohm");
/** milli-ohm. */
public static final ElectricalResistance.Unit mohm = Units.resolve(ElectricalResistance.Unit.class, "mohm");
/** kilo-ohm. */
public static final ElectricalResistance.Unit kohm = Units.resolve(ElectricalResistance.Unit.class, "kohm");
/** mega-ohm. */
public static final ElectricalResistance.Unit Mohm = Units.resolve(ElectricalResistance.Unit.class, "Mohm");
/** giga-ohm. */
public static final ElectricalResistance.Unit Gohm = Units.resolve(ElectricalResistance.Unit.class, "Gohm");
/** ab-ohm. */
public static final ElectricalResistance.Unit abohm =
ohm.deriveUnit("abohm", "ab\u03A9", "abohm", 1.0E-9, UnitSystem.CGS_EMU);
/** stat-ohm. */
public static final ElectricalResistance.Unit statohm =
ohm.deriveUnit("stohm", "st\u03A9", "statohm", 8.987551787E11, UnitSystem.CGS_EMU);
/**
* Create a new ElectricalResistance unit.
* @param id the id or main abbreviation of the unit
* @param name the full name of the unit
* @param scaleFactorToBaseUnit the scale factor of the unit to convert it TO the base (SI) unit
* @param unitSystem the unit system such as SI or IMPERIAL
*/
public Unit(final String id, final String name, final double scaleFactorToBaseUnit, final UnitSystem unitSystem)
{
super(id, name, new LinearScale(scaleFactorToBaseUnit), unitSystem);
}
/**
* Return a derived unit for this unit, with textual abbreviation(s) and a display abbreviation.
* @param textualAbbreviation the textual abbreviation of the unit, which doubles as the id
* @param displayAbbreviation the display abbreviation of the unit
* @param name the full name of the unit
* @param scale the scale to use to convert between this unit and the standard (e.g., SI, BASE) unit
* @param unitSystem unit system, e.g. SI or Imperial
*/
public Unit(final String textualAbbreviation, final String displayAbbreviation, final String name, final Scale scale,
final UnitSystem unitSystem)
{
super(textualAbbreviation, displayAbbreviation, name, scale, unitSystem);
}
@Override
public SIUnit siUnit()
{
return SI_UNIT;
}
@Override
public Unit getBaseUnit()
{
return SI;
}
@Override
public ElectricalResistance ofSi(final double si)
{
return ElectricalResistance.ofSi(si);
}
@Override
public Unit deriveUnit(final String textualAbbreviation, final String displayAbbreviation, final String name,
final double scaleFactor, final UnitSystem unitSystem)
{
if (getScale() instanceof LinearScale ls)
{
return new ElectricalResistance.Unit(textualAbbreviation, displayAbbreviation, name,
new LinearScale(ls.getScaleFactorToBaseUnit() * scaleFactor), unitSystem);
}
throw new UnitRuntimeException("Only possible to derive a unit from a unit with a linear scale");
}
}
}