The Quantity class. More...

#include <Quantity.h>

Public Member Functions
const QuantityFormat &	getFormat () const

const Unit &	getUnit () const
	returns the unit of the quantity More...

QString	getUserString () const

QString	getUserString (double &factor, QString &unitString) const
	transfer to user preferred unit/potence More...

QString	getUserString (UnitsSchema *schema, double &factor, QString &unitString) const

double	getValue () const
	get the Value of the quantity More...

double	getValueAs (const Quantity &) const
	get the Value in a special unit given as quantity. More...

bool	isDimensionless () const
	true if it has a number without a unit More...

bool	isQuantity () const
	true if it has a number and a valid unit More...

bool	isValid () const
	true if it has a number with or without a unit More...

Quantity	operator* (const Quantity &p) const
	Operators. More...

Quantity	operator* (double p) const

Quantity	operator+ (const Quantity &p) const

Quantity &	operator+= (const Quantity &p)

Quantity	operator- () const

Quantity	operator- (const Quantity &p) const

Quantity &	operator-= (const Quantity &p)

Quantity	operator/ (const Quantity &p) const

Quantity	operator/ (double p) const

bool	operator< (const Quantity &) const

bool	operator<= (const Quantity &) const

Quantity &	operator= (const Quantity &)

bool	operator== (const Quantity &) const

bool	operator> (const Quantity &) const

bool	operator>= (const Quantity &) const

Quantity	pow (const Quantity &) const

Quantity	pow (double) const

	Quantity ()
	default constructor More...

	Quantity (const Quantity &)

	Quantity (double value, const QString &unit)

	Quantity (double value, const Unit &unit=Unit())

void	setFormat (const QuantityFormat &f)

void	setInvalid ()
	sets the quantity invalid More...

void	setUnit (const Unit &un)
	set the unit of the quantity More...

void	setValue (double val)
	set the value of the quantity More...

	~Quantity ()
	Destruction. More...

Static Public Member Functions
static Quantity	parse (const QString &string)

Static Public Attributes
static Quantity	Ampere

static Quantity	AngMinute

static Quantity	AngSecond

static Quantity	Bar

static Quantity	Calorie

static Quantity	Candela

static Quantity	CentiMetre

static Quantity	Coulomb

static Quantity	CubicFoot

static Quantity	DeciMetre

static Quantity	Degree

static Quantity	ElectronVolt

static Quantity	Farad

static Quantity	Foot

static Quantity	Gauss

static Quantity	GigaHertz

static Quantity	GigaPascal

static Quantity	Gon

static Quantity	Gram

static Quantity	Henry

static Quantity	Hertz

static Quantity	Hour

static Quantity	Hundredweights

static Quantity	Inch

static Quantity	Joule

static Quantity	Kelvin

static Quantity	KiloAmpere

static Quantity	KiloCalorie

static Quantity	KiloElectronVolt

static Quantity	KiloGram

static Quantity	KiloHertz

static Quantity	KiloJoule

static Quantity	KiloMetre

static Quantity	KiloNewton

static Quantity	KiloNewtonPerMeter

static Quantity	KiloOhm

static Quantity	KiloPascal

static Quantity	KiloSiemens

static Quantity	KiloVolt

static Quantity	KiloWatt

static Quantity	KiloWattHour

static Quantity	KMH

static Quantity	KSI

static Quantity	Liter

static Quantity	MegaAmpere

static Quantity	MegaElectronVolt

static Quantity	MegaHertz

static Quantity	MegaNewton

static Quantity	MegaNewtonPerMeter

static Quantity	MegaOhm

static Quantity	MegaPascal

static Quantity	MegaSiemens

static Quantity	Metre

static Quantity	MicroFarad

static Quantity	MicroGram

static Quantity	MicroHenry

static Quantity	MicroKelvin

static Quantity	MicroMetre

static Quantity	MicroSiemens

static Quantity	Mile

static Quantity	MilePerHour

static Quantity	MilliAmpere

static Quantity	MilliBar

static Quantity	MilliFarad

static Quantity	MilliGram

static Quantity	MilliHenry

static Quantity	MilliJoule

static Quantity	MilliKelvin

static Quantity	MilliLiter

static Quantity	MilliMetre

static Quantity	MilliMole

static Quantity	MilliNewton

static Quantity	MilliNewtonPerMeter

static Quantity	MilliSiemens

static Quantity	MilliVolt

static Quantity	MilliWatt

static Quantity	Minute

static Quantity	Mole

static Quantity	MPH

static Quantity	MPSI

static Quantity	mTorr

static Quantity	NanoFarad

static Quantity	NanoHenry

static Quantity	NanoMetre
	Predefined Unit types. More...

static Quantity	Newton

static Quantity	NewtonMeter

static Quantity	NewtonPerMeter

static Quantity	Oersted

static Quantity	Ohm

static Quantity	Ounce

static Quantity	Pascal

static Quantity	PicoFarad

static Quantity	Pound

static Quantity	PoundForce

static Quantity	PSI

static Quantity	Radian

static Quantity	Second

static Quantity	Siemens

static Quantity	SquareFoot

static Quantity	Stone

static Quantity	TeraHertz

static Quantity	Tesla

static Quantity	Thou

static Quantity	Ton

static Quantity	Torr

static Quantity	Volt

static Quantity	VoltAmpere

static Quantity	VoltAmpereSecond

static Quantity	Watt

static Quantity	WattSecond

static Quantity	Weber

static Quantity	Yard

static Quantity	yTorr

Detailed Description

The Quantity class.

Constructor & Destructor Documentation

◆ Quantity() [1/4]

Quantity::Quantity ( )

default constructor

Referenced by operator*(), operator+(), operator-(), operator/(), parse(), and pow().

◆ Quantity() [2/4]

Quantity::Quantity ( const Quantity & that )

◆ Quantity() [3/4]

Quantity::Quantity	(	double	value,
		const Unit &	unit = `Unit()`
	)

explicit

◆ Quantity() [4/4]

Quantity::Quantity	(	double	value,
		const QString &	unit
	)

explicit

References parse().

◆ ~Quantity()

Base::Quantity::~Quantity ( )

Destruction.

Member Function Documentation

◆ getFormat()

const QuantityFormat & Base::Quantity::getFormat ( ) const

Referenced by Gui::InputField::getFormat(), Gui::InputField::getPrecision(), Sketcher::Constraint::getPresentationValue(), Gui::InputField::newInput(), Base::UnitsSchemaImperialBuilding::schemaTranslate(), Gui::InputField::selectNumber(), Gui::InputField::setFormat(), Gui::InputField::setPrecision(), Base::UnitsSchema::toLocale(), and Gui::QuantitySpinBoxPrivate::validate().

◆ getUnit()

const Unit & Base::Quantity::getUnit ( ) const

returns the unit of the quantity

◆ getUserString() [1/3]

QString Base::Quantity::getUserString ( ) const

◆ getUserString() [2/3]

QString Quantity::getUserString	(	double &	factor,
		QString &	unitString
	)		const

transfer to user preferred unit/potence

References Base::UnitsApi::schemaTranslate().

Referenced by PartGui::createLinearDimension(), Gui::PointMarker::customEvent(), SpreadsheetGui::SheetModel::data(), ConstraintItem::data(), Gui::TDragger::drag(), Gui::RDragger::drag(), PartGui::dumpLinearResults(), Gui::InputField::focusOutEvent(), TechDraw::DrawViewDimension::formatValue(), Gui::InputField::getQuantityString(), Gui::InputField::getUnitText(), Gui::InputField::keyPressEvent(), Gui::InputField::setRawText(), Gui::PropertyEditor::PropertyPlacementItem::toolTip(), Gui::PropertyEditor::PropertyVectorDistanceItem::toString(), Gui::PropertyEditor::PropertyRotationItem::toString(), Gui::PropertyEditor::PropertyPlacementItem::toString(), and Gui::InputField::wheelEvent().

◆ getUserString() [3/3]

QString Quantity::getUserString	(	UnitsSchema *	schema,
		double &	factor,
		QString &	unitString
	)		const

References Base::UnitsSchema::schemaTranslate().

◆ getValue()

double Base::Quantity::getValue ( ) const

get the Value of the quantity

Referenced by ImageGui::ImageOrientationDialog::accept(), InspectionGui::VisualInspection::accept(), PartGui::DlgFilletEdges::accept(), PartGui::OffsetWidget::accept(), PartGui::ThicknessWidget::accept(), MeshPartGui::CrossSections::apply(), Gui::QuantitySpinBox::apply(), ConstraintItem::data(), PartGui::DlgPrimitives::DlgPrimitives(), SketcherGui::PropertyConstraintListItem::event(), TechDraw::DrawViewDimension::formatValue(), FemGui::TaskFemConstraintForce::getForce(), Gui::LocationWidget::getPosition(), InspectionGui::VisualInspection::loadSettings(), MeshGui::DlgSettingsImportExport::loadSettings(), TechDraw::DrawSVGTemplate::processTemplate(), App::pyFromQuantity(), Gui::InputField::rawValue(), InspectionGui::VisualInspection::saveSettings(), MeshGui::DlgSettingsImportExport::saveSettings(), Base::UnitsSchemaImperial1::schemaTranslate(), Base::UnitsSchemaImperialBuilding::schemaTranslate(), Base::UnitsSchemaImperialCivil::schemaTranslate(), Base::UnitsSchemaInternal::schemaTranslate(), Base::UnitsSchemaMKS::schemaTranslate(), Gui::InputField::setMaximum(), Gui::InputField::setMinimum(), App::PropertyQuantity::setPyObject(), App::PropertyQuantityConstraint::setPyObject(), Gui::InputField::setValue(), Base::UnitsSchema::toLocale(), and Gui::Dialog::DlgUnitsCalculator::valueChanged().

◆ getValueAs()

double Quantity::getValueAs ( const Quantity & q ) const

get the Value in a special unit given as quantity.

One can use one of the predifeined quantity units in this class

Referenced by FemGui::TaskFemConstraintTemperature::get_cflux(), FemGui::TaskFemConstraintSpring::get_normalStiffness(), FemGui::TaskFemConstraintPressure::get_Pressure(), FemGui::TaskFemConstraintSpring::get_tangentialStiffness(), FemGui::TaskFemConstraintInitialTemperature::get_temperature(), FemGui::TaskFemConstraintTemperature::get_temperature(), FemGui::TaskFemConstraintHeatflux::getAmbientTemp(), and FemGui::TaskFemConstraintHeatflux::getFilmCoef().

◆ isDimensionless()

bool Quantity::isDimensionless ( ) const

true if it has a number without a unit

References isValid().

◆ isQuantity()

bool Quantity::isQuantity ( ) const

true if it has a number and a valid unit

References isValid().

◆ isValid()

bool Quantity::isValid ( ) const

true if it has a number with or without a unit

Referenced by isDimensionless(), and isQuantity().

◆ operator*() [1/2]

Quantity Quantity::operator* ( const Quantity & p ) const

Operators.

References Quantity().

◆ operator*() [2/2]

Quantity Quantity::operator* ( double p ) const

References Quantity().

◆ operator+()

Quantity Quantity::operator+ ( const Quantity & p ) const

References Quantity().

◆ operator+=()

Quantity & Quantity::operator+= ( const Quantity & p )

◆ operator-() [1/2]

Quantity Quantity::operator- ( ) const

References Quantity().

◆ operator-() [2/2]

Quantity Quantity::operator- ( const Quantity & p ) const

References Quantity().

◆ operator-=()

Quantity & Quantity::operator-= ( const Quantity & p )

◆ operator/() [1/2]

Quantity Quantity::operator/ ( const Quantity & p ) const

References Quantity().

◆ operator/() [2/2]

Quantity Quantity::operator/ ( double p ) const

References Quantity().

◆ operator<()

bool Quantity::operator< ( const Quantity & that ) const

◆ operator<=()

bool Quantity::operator<= ( const Quantity & that ) const

◆ operator=()

Quantity & Quantity::operator= ( const Quantity & New )

◆ operator==()

bool Quantity::operator== ( const Quantity & that ) const

◆ operator>()

bool Quantity::operator> ( const Quantity & that ) const

◆ operator>=()

bool Quantity::operator>= ( const Quantity & that ) const

◆ parse()

Quantity Quantity::parse ( const QString & string )

static

References Quantity().

Referenced by BOPTools.GeneralFuseResult.GeneralFuseResult::explodeCompounds(), TechDraw::DrawViewDimension::formatValue(), Gui::QuantitySpinBoxPrivate::parseString(), TechDraw::DrawSVGTemplate::processTemplate(), Quantity(), Gui::InputField::setRawText(), Gui::InputField::setUnitText(), Gui::QuantitySpinBox::setUnitText(), Base::UnitsApi::sParseQuantity(), BOPTools.GeneralFuseResult.GeneralFuseResult::splitAggregates(), Base::UnitsApi::toDouble(), Base::UnitsApi::toQuantity(), Base::Unit::Unit(), and Gui::Dialog::DlgUnitsCalculator::valueChanged().

◆ pow() [1/2]

Quantity Quantity::pow ( const Quantity & p ) const

References Quantity().

◆ pow() [2/2]

Quantity Quantity::pow ( double p ) const

References Quantity().

◆ setFormat()

void Base::Quantity::setFormat ( const QuantityFormat & f )

Referenced by Sketcher::Constraint::getPresentationValue(), PathScripts.PathInspect.GCodeHighlighter::highlightBlock(), PathScripts.PostUtils.GCodeHighlighter::highlightBlock(), Gui::InputField::setFormat(), and Gui::InputField::setPrecision().

◆ setInvalid()

void Quantity::setInvalid ( )

sets the quantity invalid

◆ setUnit()

void Base::Quantity::setUnit ( const Unit & un )

set the unit of the quantity

Referenced by SketcherGui::EditDatumDialog::exec(), TechDraw::DrawViewDimension::formatValue(), Sketcher::Constraint::getPresentationValue(), TechDraw::DrawSVGTemplate::processTemplate(), TechDrawGui::TaskCenterLine::setUiEdit(), TechDrawGui::TaskCenterLine::setUiPrimary(), Gui::InputField::setUnit(), Gui::QuantitySpinBoxPrivate::validate(), and SketcherGui::PropertyConstraintListItem::value().

◆ setValue()

void Base::Quantity::setValue ( double val )

set the value of the quantity

Referenced by SketcherGui::EditDatumDialog::exec(), TechDraw::DrawViewDimension::formatValue(), Sketcher::Constraint::getPresentationValue(), Gui::View3DInventorViewer::printDimension(), Gui::schemaTranslatePoint(), Gui::InputField::setMaximum(), Gui::InputField::setMinimum(), App::PropertyQuantityConstraint::setPyObject(), TechDrawGui::TaskCenterLine::setUiEdit(), TechDrawGui::TaskCenterLine::setUiPrimary(), Gui::InputField::setValue(), Gui::QuantitySpinBox::setValue(), and SketcherGui::PropertyConstraintListItem::value().

Member Data Documentation

◆ Ampere

Quantity Quantity::Ampere

static

◆ AngMinute

Quantity Quantity::AngMinute

static

◆ AngSecond

Quantity Quantity::AngSecond

static

◆ Bar

Quantity Quantity::Bar

static

◆ Calorie

Quantity Quantity::Calorie

static

◆ Candela

Quantity Quantity::Candela

static

◆ CentiMetre

Quantity Quantity::CentiMetre

static

◆ Coulomb

Quantity Quantity::Coulomb

static

◆ CubicFoot

Quantity Quantity::CubicFoot

static

◆ DeciMetre

Quantity Quantity::DeciMetre

static

◆ Degree

Quantity Quantity::Degree

static

Referenced by PartGui::DlgRevolution::getAngle().

◆ ElectronVolt

Quantity Quantity::ElectronVolt

static

◆ Farad

Quantity Quantity::Farad

static

◆ Foot

Quantity Quantity::Foot

static

◆ Gauss

Quantity Quantity::Gauss

static

◆ GigaHertz

Quantity Quantity::GigaHertz

static

◆ GigaPascal

Quantity Quantity::GigaPascal

static

◆ Gon

Quantity Quantity::Gon

static

◆ Gram

Quantity Quantity::Gram

static

◆ Henry

Quantity Quantity::Henry

static

◆ Hertz

Quantity Quantity::Hertz

static

◆ Hour

Quantity Quantity::Hour

static

◆ Hundredweights

Quantity Quantity::Hundredweights

static

◆ Inch

Quantity Quantity::Inch

static

◆ Joule

Quantity Quantity::Joule

static

◆ Kelvin

Quantity Quantity::Kelvin

static

Referenced by FemGui::TaskFemConstraintInitialTemperature::get_temperature(), FemGui::TaskFemConstraintTemperature::get_temperature(), and FemGui::TaskFemConstraintHeatflux::getAmbientTemp().

◆ KiloAmpere

Quantity Quantity::KiloAmpere

static

◆ KiloCalorie

Quantity Quantity::KiloCalorie

static

◆ KiloElectronVolt

Quantity Quantity::KiloElectronVolt

static

◆ KiloGram

Quantity Quantity::KiloGram

static

◆ KiloHertz

Quantity Quantity::KiloHertz

static

◆ KiloJoule

Quantity Quantity::KiloJoule

static

◆ KiloMetre

Quantity Quantity::KiloMetre

static

◆ KiloNewton

Quantity Quantity::KiloNewton

static

◆ KiloNewtonPerMeter

Quantity Quantity::KiloNewtonPerMeter

static

◆ KiloOhm

Quantity Quantity::KiloOhm

static

◆ KiloPascal

Quantity Quantity::KiloPascal

static

◆ KiloSiemens

Quantity Quantity::KiloSiemens

static

◆ KiloVolt

Quantity Quantity::KiloVolt

static

◆ KiloWatt

Quantity Quantity::KiloWatt

static

◆ KiloWattHour

Quantity Quantity::KiloWattHour

static

◆ KMH

Quantity Quantity::KMH

static

◆ KSI

Quantity Quantity::KSI

static

◆ Liter

Quantity Quantity::Liter

static

◆ MegaAmpere

Quantity Quantity::MegaAmpere

static

◆ MegaElectronVolt

Quantity Quantity::MegaElectronVolt

static

◆ MegaHertz

Quantity Quantity::MegaHertz

static

◆ MegaNewton

Quantity Quantity::MegaNewton

static

◆ MegaNewtonPerMeter

Quantity Quantity::MegaNewtonPerMeter

static

◆ MegaOhm

Quantity Quantity::MegaOhm

static

◆ MegaPascal

Quantity Quantity::MegaPascal

static

Referenced by FemGui::TaskFemConstraintPressure::get_Pressure().

◆ MegaSiemens

Quantity Quantity::MegaSiemens

static

◆ Metre

Quantity Quantity::Metre

static

◆ MicroFarad

Quantity Quantity::MicroFarad

static

◆ MicroGram

Quantity Quantity::MicroGram

static

◆ MicroHenry

Quantity Quantity::MicroHenry

static

◆ MicroKelvin

Quantity Quantity::MicroKelvin

static

◆ MicroMetre

Quantity Quantity::MicroMetre

static

◆ MicroSiemens

Quantity Quantity::MicroSiemens

static

◆ Mile

Quantity Quantity::Mile

static

◆ MilePerHour

Quantity Quantity::MilePerHour

static

◆ MilliAmpere

Quantity Quantity::MilliAmpere

static

◆ MilliBar

Quantity Quantity::MilliBar

static

◆ MilliFarad

Quantity Quantity::MilliFarad

static

◆ MilliGram

Quantity Quantity::MilliGram

static

◆ MilliHenry

Quantity Quantity::MilliHenry

static

◆ MilliJoule

Quantity Quantity::MilliJoule

static

◆ MilliKelvin

Quantity Quantity::MilliKelvin

static

◆ MilliLiter

Quantity Quantity::MilliLiter

static

◆ MilliMetre

Quantity Quantity::MilliMetre

static

Referenced by PartGui::DlgRevolution::getPosition(), Gui::View3DInventorViewer::printDimension(), and Gui::schemaTranslatePoint().

◆ MilliMole

Quantity Quantity::MilliMole

static

◆ MilliNewton

Quantity Quantity::MilliNewton

static

◆ MilliNewtonPerMeter

Quantity Quantity::MilliNewtonPerMeter

static

◆ MilliSiemens

Quantity Quantity::MilliSiemens

static

◆ MilliVolt

Quantity Quantity::MilliVolt

static

◆ MilliWatt

Quantity Quantity::MilliWatt

static

◆ Minute

Quantity Quantity::Minute

static

◆ Mole

Quantity Quantity::Mole

static

◆ MPH

Quantity Quantity::MPH

static

◆ MPSI

Quantity Quantity::MPSI

static

◆ mTorr

Quantity Quantity::mTorr

static

◆ NanoFarad

Quantity Quantity::NanoFarad

static

◆ NanoHenry

Quantity Quantity::NanoHenry

static

◆ NanoMetre

Quantity Quantity::NanoMetre

static

Predefined Unit types.

◆ Newton

Quantity Quantity::Newton

static

◆ NewtonMeter

Quantity Quantity::NewtonMeter

static

◆ NewtonPerMeter

Quantity Quantity::NewtonPerMeter

static

Referenced by FemGui::TaskFemConstraintSpring::get_normalStiffness(), and FemGui::TaskFemConstraintSpring::get_tangentialStiffness().

◆ Oersted

Quantity Quantity::Oersted

static

◆ Ohm

Quantity Quantity::Ohm

static

◆ Ounce

Quantity Quantity::Ounce

static

◆ Pascal

Quantity Quantity::Pascal

static

◆ PicoFarad

Quantity Quantity::PicoFarad

static

◆ Pound

Quantity Quantity::Pound

static

◆ PoundForce

Quantity Quantity::PoundForce

static

◆ PSI

Quantity Quantity::PSI

static

◆ Radian

Quantity Quantity::Radian

static

◆ Second

Quantity Quantity::Second

static

◆ Siemens

Quantity Quantity::Siemens

static

◆ SquareFoot

Quantity Quantity::SquareFoot

static

◆ Stone

Quantity Quantity::Stone

static

◆ TeraHertz

Quantity Quantity::TeraHertz

static

◆ Tesla

Quantity Quantity::Tesla

static

◆ Thou

Quantity Quantity::Thou

static

◆ Ton

Quantity Quantity::Ton

static

◆ Torr

Quantity Quantity::Torr

static

◆ Volt

Quantity Quantity::Volt

static

◆ VoltAmpere

Quantity Quantity::VoltAmpere

static

◆ VoltAmpereSecond

Quantity Quantity::VoltAmpereSecond

static

◆ Watt

Quantity Quantity::Watt

static

Referenced by FemGui::TaskFemConstraintTemperature::get_cflux().

◆ WattSecond

Quantity Quantity::WattSecond

static

◆ Weber

Quantity Quantity::Weber

static

◆ Yard

Quantity Quantity::Yard

static

◆ yTorr

Quantity Quantity::yTorr

static

The documentation for this class was generated from the following files:

FreeCAD/src/Base/Quantity.h
FreeCAD/src/Base/Quantity.cpp

Public Member Functions

Static Public Member Functions

Static Public Attributes

Detailed Description

Constructor & Destructor Documentation

◆ Quantity() [1/4]

◆ Quantity() [2/4]

◆ Quantity() [3/4]

◆ Quantity() [4/4]

◆ ~Quantity()

Member Function Documentation

◆ getFormat()

◆ getUnit()

◆ getUserString() [1/3]

◆ getUserString() [2/3]

◆ getUserString() [3/3]

◆ getValue()

◆ getValueAs()

◆ isDimensionless()

◆ isQuantity()

◆ isValid()

◆ operator*() [1/2]

◆ operator*() [2/2]

◆ operator+()

◆ operator+=()

◆ operator-() [1/2]

◆ operator-() [2/2]

◆ operator-=()

◆ operator/() [1/2]

◆ operator/() [2/2]

◆ operator<()

◆ operator<=()

◆ operator=()

◆ operator==()

◆ operator>()

◆ operator>=()

◆ parse()

◆ pow() [1/2]

◆ pow() [2/2]

◆ setFormat()

◆ setInvalid()

◆ setUnit()

◆ setValue()

Member Data Documentation

◆ Ampere

◆ AngMinute

◆ AngSecond

◆ Bar

◆ Calorie

◆ Candela

◆ CentiMetre

◆ Coulomb

◆ CubicFoot

◆ DeciMetre

◆ Degree

◆ ElectronVolt

◆ Farad

◆ Foot

◆ Gauss

◆ GigaHertz

◆ GigaPascal

◆ Gon

◆ Gram

◆ Henry

◆ Hertz

◆ Hour

◆ Hundredweights

◆ Inch

◆ Joule

◆ Kelvin

◆ KiloAmpere

◆ KiloCalorie

◆ KiloElectronVolt

◆ KiloGram

◆ KiloHertz

◆ KiloJoule

◆ KiloMetre

◆ KiloNewton

◆ KiloNewtonPerMeter

◆ KiloOhm