Electric Circuit Simulation: A Measurement-First Guide
Learn a practical browser-lab workflow for sources, meters, loads, and measurements with DigiSim Electricity Lab.
An electric-circuit simulator becomes useful when it helps you make and test a prediction—not merely draw a neat schematic. A strong first workflow is therefore measurement-first: choose a source and a load, predict the current and voltage, connect the appropriate meters, and compare the result with the prediction.
DigiSim’s Electricity Lab is the workspace for this kind of school-laboratory circuit. Its current palette contains 37 entries, including sources, switches, meters, loads, passive components, connections, and annotations. The accompanying course contains 109 experiments in 16 parts, with 11 public experiments in the captured catalog.
Product facts reviewed: August 31, 2026. This article was aligned on September 1. Counts come from DigiSim’s versioned course and product-facts inputs; plan availability remains runtime-owned.
What the Electricity Lab is for
Use the Electricity Lab when the question is about observable voltage, current, power, switching, or component behavior on a teaching bench. Typical investigations include:
- putting an ammeter in series and a voltmeter across a load;
- changing resistance and observing the resulting current;
- comparing DC and AC sources;
- inspecting a waveform with an oscilloscope;
- exploring diodes, capacitors, inductors, transformers, and sensors; and
- rewiring switches and relay contacts to change the path through a circuit.
The platform has four purpose-built labs. Electricity is not a skin over the Logic, Relay, or Analog engines, and a project or capability from one lab should not be assumed to exist in another. Use Compare DigiSim labs when choosing a workspace.
A first measurement workflow
Start with the smallest circuit that can answer your question.
- Open a new Electricity Lab bench.
- Place one source, one load, and a knife switch.
- Complete the loop and close the switch.
- Put an ammeter in series with the loop.
- Put a voltmeter across the load.
- Record the readings, change one variable, and measure again.
The position of a meter is part of the experiment. An ammeter measures the current through its branch, so it belongs in series. A voltmeter compares two potentials, so it belongs across the component being measured. The Electricity component reference explains the modeled instruments and their connections in more detail.
Sources, loads, and controls
A useful bench can be read as a chain of roles:
| Role | Examples | Question to ask |
|---|---|---|
| Source | dry cell, battery holder, DC supply, AC supply | What voltage or current drives the circuit? |
| Control | knife, SPDT, or DPDT switch; relay | Which path is open or closed? |
| Load | lamp, resistor, motor, buzzer, LED | Where is electrical energy being used? |
| Instrument | ammeter, voltmeter, wattmeter, multimeter, oscilloscope | Which quantity am I observing? |
This role-based reading scales better than memorizing a finished diagram. When a circuit behaves unexpectedly, trace the energy path from source through control and load, then check whether each instrument is connected to measure the intended quantity.
Build a prediction before reading the meter
For a resistive DC circuit, begin with Ohm’s law: current equals voltage divided by resistance. Treat that calculation as a prediction rather than an answer copied after the simulation runs. Then ask why the reading might differ: a modeled source can have internal resistance, an instrument can load a circuit, and a nonlinear device such as an LED does not behave like a fixed resistor.
For AC or time-varying circuits, distinguish a waveform’s instantaneous value from the value a particular instrument reports. The oscilloscope shows voltage over time; another meter may show an average or RMS-related reading according to its model. The purpose of simulation is to make those differences visible and repeatable.
A course path from simple loops to instruments
The DigiSim courses hub hands off to the current catalog rather than maintaining a second, manually numbered syllabus. The Electricity course presently resolves to 109 experiments across 16 parts. Start with sources and simple loops, add current and voltage measurement, then move toward reactive components, AC behavior, and more involved instruments.
Public experiments can be opened without treating a marketing page as the catalog authority. The current course route is Learn Electricity.
Saving, sharing, and export boundaries
Guest work in Electricity Lab uses a single-browser draft. It should not be described as an offline guarantee or a portable project file. Signed-in cloud persistence is governed by the active account and plan policy.
Electricity supports unlisted clone links under the current runtime sharing policy. “Unlisted” means anyone who receives the link can use it; it is not a promise of authenticated confidentiality. DigiSim has not established a user-facing Electricity project download, import, or embed route. See Formats and exports for the lab-by-lab boundary before designing a handoff workflow.
Use simulation as a model, not a safety certificate
The bench is an educational model. It does not certify a real component, replace its datasheet, or prove that a physical circuit is safe. Real components have tolerances, thermal limits, parasitics, failure modes, and ratings that a teaching model may simplify.
Use the simulator to form hypotheses, practice measurement topology, and explain relationships. Use appropriate supervision, equipment procedures, and manufacturer documentation for physical work.
Where to continue
- Open the Electricity Lab for the product overview and current free boundary.
- Browse the Electricity component documentation.
- Follow the catalog-backed Electricity course.
- Compare persistence, sharing, and formats on Compare labs.
A good next experiment is deliberately small: one source, two different loads, and the same two measurements. Predict first, measure second, and explain the difference in one sentence.