Electricity LabReleased

Make electricity visible.

Build the kind of circuit used on a classroom bench, then inspect the simulated response. Connect batteries, bulbs, switches, meters, and virtual leads while calculated voltage, current, resistance, heat, and brightness update interactively.

Open the Electricity Lab Browse all Electricity lessons

Runs in your browser · no installation · open a new bench without signing in

DigiSim Electricity Lab showing a virtual classroom circuit bench with instruments and wired components — The actual Electricity Lab workspace — devices, leads, live instruments, and notebook in one browser bench
Open the Electricity Lab

37current palette entries

Sources, switches, meters, loads, components, and workbench tools.

109guided experiments

A dependency-ordered path from a closed loop to source and network behavior.

Livemeasurement

Voltage, current, waveforms, heat, motion, and brightness update while you work.

19free · no account

Direct answer

What is DigiSim Electricity Lab?

DigiSim Electricity Lab is an interactive online electricity simulator for learning circuit physics. Instead of drawing only schematic symbols, you place recognizable bench devices, connect their terminals with leads, switch on the circuit, and observe the instruments respond. The simulation applies circuit laws while also modeling visible effects such as moving meter needles, filament heating, bulb brightness, motor motion, and overload damage.

Best for: middle-school through introductory college physics, classroom demonstrations, homework exploration, and pre-lab practice.

EleCastElectricity Lab

144 live circuits

Guided Electricity course

109 experiments, organized into 16 parts.

The course is a ladder: each rung introduces one new device, topology, or variable and assumes the rungs before it. Every experiment opens as an editable simulated bench.

Parts I and II—11 experiments through current measurement—are public. Pro includes the complete ladder.

Browse all Electricity lessons

LOOPComplete paths and controllable circuits6
CURRENTCurrent, direction and measurement5
VOLTPotential difference between named points5
OHMResistance as a testable relationship6
NETConnectivity, equivalent resistance and loading6
ENERGYEnergy transfer, power and operating ratings6
WIREResistance, geometry and material models4
SOURCEReal voltage and current sources6
NONLINEARNon-ohmic devices and operating points6
SENSORFrom imposed conditions to electrical evidence5
METERMeasurement changes the measured circuit6
SCOPEReading time-domain evidence4
STORECharge storage and controlled initial conditions5
RCFirst-order capacitor dynamics6
RLInductor current and discharge paths6
KIRCHHOFFSigned constraints in irreducible networks6
EQUIVPort models and linear network methods6
RLCSecond-order response and damping5
ACSinusoids, reactance and complex impedance7
FILTERPassive frequency response and loading5
POWERReal power, resonance and compensation5
TRANSFORMCoupled coils and load reflection5
RECTIFYFrom alternating voltage to a loaded DC output5
CONTROLElectrical control and electromechanical conversion6
DESIGNIndependent investigation and design studios4
MATHWorked problems and self-checks8

From prediction to measurement in four steps

How it works

Start from a guided experiment or an empty bench. The interface keeps the physical act of wiring central, so the result is something you can reason about—not a number produced by a hidden form.

01
Choose an experiment or place equipment
Load a guided circuit, or drag the battery, switch, load, and instruments you need onto an empty bench.
02
Wire terminal to terminal
Connect leads deliberately. Series instruments, parallel instruments, polarity, range posts, and open loops all matter.
03
Switch on and change one variable
Close the switch, turn a rheostat, change a source, or move an instrument. The solver updates without replacing the circuit.
04
Measure, compare, and explain
Read the meters and scope, compare observation with prediction, and capture the explanation in the bench notebook.

Start a new bench

Learn circuit physics by doing it

A virtual bench, not a worksheet

The Electricity Lab combines a familiar classroom setup with a real-time numerical solver, so a learner can predict, build, measure, and explain the same circuit in one place.

Recognizable classroom equipment

Work with dry cells, battery holders, DC and AC supplies, knife and SPDT switches, bulbs, rheostats, resistance boxes, motors, buzzers, transformers, and more.

Instruments that must be wired correctly

Use ammeters, voltmeters, galvanometers, a multimeter, and an oscilloscope. Meter range is selected by the terminal you wire, just as it is on classroom hardware.

Physics you can see

Bulbs warm and brighten with dissipated power, meter needles move dynamically, motors respond to load, and unsafe current can heat leads or damage instruments.

A structured experiment ladder

Follow 109 implemented builds across 16 parts covering closed circuits, current, voltage, resistance, series and parallel networks, Kirchhoff’s laws, and non-ideal sources.

Real-time Rust/WebAssembly solving

The same browser-native circuit engine behind DigiSim Analog solves the network continuously while controls and component values change.

Notebook, local drafts, and sharing

Record observations beside the bench, keep one anonymous local draft, or sign in when you want supported cloud storage and an unlisted circuit link. Anyone with an unlisted URL can view it.

Who it is for

A practical bridge between equations and hardware

Use the simulator where real apparatus is limited, where a mistake would be costly, or where students need to repeat an experiment until the relationship becomes intuitive.

Physics classrooms

Demonstrate current continuity, voltage drops, series and parallel behavior, meter placement, and source resistance on a projected live bench.

Independent learners

Move from one controlled experiment to the next without needing a component kit, power supply, or lab timetable.

Pre-lab and homework

Let students predict and test a circuit before handling equipment, then use the real lab to investigate tolerance, contact quality, and measurement uncertainty.

Start with a useful DC bench. Unlock the time domain when you need it.

Honest access

The live product policy—not hard-coded marketing copy—controls the catalog. Today, most physical apparatus and the first two course parts are free.

Free

A practical bench for the fundamentals

Open a bench without an account and study foundational DC circuits with familiar classroom apparatus.

25device IDs in the current Free policy

Batteries, switches, bulbs, resistors, rheostats, motors, buzzers, and sensors
Ammeters, voltmeters, galvanometers, and a multimeter
11 guided experiments through current measurement
Anonymous local draft with no installation

Open the free bench

ProINCLUDED WITH PRO

Complete the bench and course

Add the AC and time-domain apparatus, then follow every experiment from the first loop through real-source efficiency.

109 / 109guided experiments included

All 37 current palette entries
AC source, capacitors, inductor, transformer, and oscilloscope
All 16 course parts
Cloud saves and plan features

See Pro access

Questions answered

Electricity Lab FAQ

Is DigiSim Electricity Lab an online circuit simulator or a set of animations?

It is an interactive circuit simulator. You choose devices, connect their modeled terminals, operate switches and controls, and receive numerical results from a live circuit solve. The guided experiments are editable circuit models, not prerecorded animations.

Can I use the Electricity Lab without an account?

Yes. You can open a new bench and keep a local browser draft without signing in. An account is used for cloud saving, managing saved circuits, and sharing from your account.

Which electrical components and instruments are included?

The current 37-entry palette includes batteries, DC and AC supplies, switches, fixed and variable resistance, bulbs, LEDs, motors, buzzers, capacitors, inductors, diodes, transformers, thermistors, photoresistors, resistance wire, ammeters, voltmeters, galvanometers, a multimeter, and an oscilloscope. The current Free policy exposes 25 device IDs.

Does the simulator follow Ohm’s law and Kirchhoff’s laws?

Yes. The network solver enforces circuit relationships rather than using precomputed outcomes. The bench also includes nonideal behavior such as source and meter resistance, a temperature-dependent bulb filament, dynamic needles, and overload states.

What is the difference between Electricity Lab and Analog Lab?

Electricity Lab presents recognizable classroom apparatus and is organized around measurement-based physics experiments. Analog Lab uses an engineering schematic editor, a larger electronics component library, and operating-point, DC, AC, transient, and live analyses. Choose Electricity for introductory physical intuition and Analog for electronics design and waveform analysis.

Can it simulate AC circuits?

The bench includes an AC source, capacitors, inductors, a transformer, a multimeter, and an oscilloscope. The current guided ladder concentrates on foundational circuit physics, while the open bench lets you explore supported AC components directly.

Build the circuit. Then believe the equation.

Open a clean bench, wire a complete loop, and watch the first measurement settle. No installation and no account required to begin.

Open a new Electricity benchBrowser-based · local draft · seven interface languages