Labo Élec

electrical lab simulator
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Labo Élec

Glossary of electrical quantities

Every quantity of the general electricity course with its symbol, its unit and the sheet where it appears: voltage, current, resistance, power, energy, charge, capacitance, inductance, reactance, impedance…

An electrical quantity is written with a symbol (U, I, R, P…) and measured in a unit of the International System (volt, ampere, ohm, watt…). The table gathers those of the fifteen sheets; prefixes (k, M, m, µ) and scientific notation are recalled in the Basics & units sheet.

QuantitySymbolUnitSheets
Absorbed powerPaWPower, energy, efficiency
Active powerPWAC power
Ammeter resistancerAΩMeasurement & instruments
Angular frequencyωrad/sAlternating current, RLC circuits
Apparent powerSVAAC power
AreaSm²Magnetism & electromagnetism
Back-EMFE'VReal generators & loads
CapacitanceCFCapacitors, RLC circuits
Capacitance to addCFAC power
ChargeqCElectrostatics
ChargeQCCapacitors
Conductor lengthlmMagnetism & electromagnetism
Constant (9 × 10⁹)kN·m²/C²Electrostatics
Cross-sectionSmm², m²Voltage & current, Ohm's law & resistance
CurrentIABasics & units, Voltage & current, Ohm's law & resistance, Power, energy, efficiency, Resistor networks, Real generators & loads, Kirchhoff's laws, Magnetism & electromagnetism, Induction & self-induction
Current (common)IAResistor networks
Current delivered by the generatorIAResistor networks
Current densityJA/mm²Voltage & current
Current in branch nInAResistor networks
Current in R₁I₁AResistor networks
Current in R₂I₂AResistor networks
Current through itInAResistor networks
DiameterdmmVoltage & current
DistancedmElectrostatics
Efficiencyη-Power, energy, efficiency
Electric fieldEV/mElectrostatics
EMFEVReal generators & loads, Kirchhoff's laws
EnergyWJBasics & units, Power, energy, efficiency, Capacitors, Induction & self-induction
Equivalent capacitanceCéqFCapacitors
Equivalent resistanceRéqΩResistor networks
Equivalent resistance of R₂ + R₃R₂₃ΩResistor networks
Equivalent resistance of R₂ ∥ R₃R₂₃ΩResistor networks
FluxΦWbMagnetism & electromagnetism, Induction & self-induction
ForceFNElectrostatics, Magnetism & electromagnetism
FrequencyfHzAlternating current
Full-scale currentiAMeasurement & instruments
Generator voltageUVResistor networks
ImpedanceZΩRLC circuits
Induced EMFEVInduction & self-induction
InductanceLHInduction & self-induction, RLC circuits
Initial phaseφradAlternating current
Internal resistancerΩReal generators & loads
Internal resistancer'ΩReal generators & loads
LengthlmOhm's law & resistance, Magnetism & electromagnetism, Induction & self-induction
Magnetic flux densityBTMagnetism & electromagnetism, Induction & self-induction
Measured resistanceRΩMeasurement & instruments
Number of resistorsn—Resistor networks
Number of turnsN-Magnetism & electromagnetism, Induction & self-induction
Peak valueUmaxVAlternating current
PeriodTsAlternating current
Phase shiftφradRLC circuits
Phase shifts before / afterφ₁, φ₂radAC power
Plate spacingemElectrostatics
PowerPWBasics & units, Power, energy, efficiency
Power dissipated by resistor nPnWResistor networks
Power factorcos φ-AC power
Quantity of electricityQCBasics & units, Voltage & current
ReactanceXΩRLC circuits
Reactive powerQvarAC power
ResistanceRΩBasics & units, Ohm's law & resistance, Power, energy, efficiency, Capacitors, RLC circuits
Resistance at 20 °CR₀ΩOhm's law & resistance
Resistance of branch nRnΩResistor networks
Resistance of each branchRΩResistor networks
Resistance of one wireRlΩResistor networks
ResistivityρΩ·mOhm's law & resistance
Resistor nRnΩResistor networks
RMS currentIARLC circuits
RMS valueUeffVAlternating current
RMS voltageUVRLC circuits
Series multiplierRaddΩMeasurement & instruments
Shunt resistanceRsΩMeasurement & instruments
Speedvm/sInduction & self-induction
Sum of loop resistancesΣRΩReal generators & loads
Temperature changeΔθ°COhm's law & resistance
Temperature coefficientα/°COhm's law & resistance
Terminal voltageUVReal generators & loads
TimetsVoltage & current, Power, energy, efficiency, Induction & self-induction
Time constantτsCapacitors, Induction & self-induction
Total currentIAResistor networks
Total current (split)IAResistor networks
Total current to measureIAMeasurement & instruments
Total equivalent resistanceRéqΩResistor networks
Total powerPWResistor networks
Total voltageUVResistor networks
Total voltage (split)UVResistor networks
Useful powerPuWPower, energy, efficiency
Vacuum permeability (4π × 10⁻⁷)µ₀T·m/AMagnetism & electromagnetism
VoltageUVBasics & units, Electrostatics, Ohm's law & resistance, Power, energy, efficiency, Capacitors
Voltage (common)UVResistor networks
Voltage across resistor nUnVResistor networks
Voltage across resistor nUnVResistor networks
Voltage across the networkUVResistor networks
Voltage dropΔUVResistor networks
Voltage dropR·IVKirchhoff's laws
Voltage on R₁U₁VResistor networks
Voltage shared by R₂ and R₃U₂₃VResistor networks
Voltmeter resistancerVΩMeasurement & instruments

All formulas · Standard electrical symbols (IEC 60617) · All sheets

Simulated time00:00:00
Q = I·t-
W = P·t-

Workbench

Circuit diagram CEI 60617

How does it work?

The perfboard: each big hole is a circuit node. You push a single leg of a component (resistor, lamp...) into it. The 4 small holes around it are connected to it: that is where chips and leads plug in.

  1. Drag a component onto the board: it snaps onto the grid. R rotates it.
  2. To join neighbouring big holes, click Jumper chip in the palette (or C) then drag on the board: a line of chips is laid at once. Bridged holes become a single node.
  3. For long links and for the power supply (placed next to the board), drag a lead from one big hole to another (or to a terminal).
  4. As soon as a loop is closed, the circuit is solved in real time (Ohm + Kirchhoff) and the diagram follows.
  5. Zoom with the wheel (or + / −, two-finger pinch); drag the background to pan, 0 fits the board. The + buttons around the board add a row or a column.

Del delete · R rotate · C chip brush · Esc cancel · wheel zoom · drag the background to pan

Confirmer

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