Voltage Simulator
Simulate resistive voltage dividers, measure potentials with virtual multimeter leads, verify Ohm's law, and observe loading attenuation effects in real time.
What is a Voltage Simulator?
A voltage simulator is an interactive circuit simulation tool that models electrical potential differences across electronic components. By applying Ohm's Law (\(V = I \cdot R\)) and Kirchhoff's Voltage Law (KVL), it allows engineers, students, and technicians to evaluate potential drops, analyze voltage divider loading errors, and measure differential potentials using virtual digital multimeter test probes.
From stepping down high battery voltages for microcontroller 3.3V ADC inputs to diagnosing ground loop potential shifts, voltage simulation provides crucial insights into circuit behavior before committing designs to physical PCBs.
How to Use the Voltage Simulator
Analyze voltage drops and test resistive networks in four intuitive steps.
Set Source Voltage
Adjust the input DC voltage (Vin) slider from 1V to 48V to establish circuit excitation.
Select Resistor Values
Tune R1 and R2 to set the desired voltage division ratio according to Ohm's Law.
Attach Load Resistor
Enable the RL checkbox to evaluate real-world loading effects and output voltage sag.
Probe with Multimeter
Assign red (+) and black (-) multimeter leads across nodes A, B, and C to measure relative potentials.
Key Simulation Features
Engineered for electronics labs, physics instruction, and hardware debugging.
Virtual DMM Display
Accurate digital LCD multimeter readout measuring differential potential difference with sign polarity.
Loading Error Analysis
Calculates exact percentage voltage sag caused by finite load impedances attached to divider outputs.
Dynamic Current Flow
Visualizes electron drift velocity throughout series and parallel branches scaled to total milliamp current.
Governing Voltage & Divider Equations
The fundamental definition of Ohm's Law establishes the relationship between voltage \(V\), current \(I\), and resistance \(R\):
In an unloaded voltage divider consisting of series resistors \(R_1\) and \(R_2\), the output voltage across \(R_2\) is:
When a load resistor RL is connected in parallel with R2, the equivalent bottom resistance becomes R_bottom = (R2 · RL) / (R2 + RL), reducing the output voltage to:
Practical Technology Applications
Microcontroller ADC Voltage Sensing
Microcontrollers like Arduino and ESP32 can only tolerate input voltages up to 3.3V or 5V. Engineers design precision resistor dividers to step down 12V or 24V industrial battery voltages into safe 0-3.3V ranges for accurate Analog-to-Digital Converter (ADC) monitoring.
Biasing Transistor Amplifiers
Bipolar Junction Transistors (BJTs) and MOSFET operational amplifiers utilize voltage divider networks on their gates or bases to establish precise DC quiescent operating points (Q-points), ensuring linear amplification without signal clipping.
Frequently Asked Questions
Electric voltage (also called electric potential difference, measured in Volts) is the work required per unit charge to move a test charge between two points in an electrical circuit. One volt equals one Joule of energy per Coulomb of charge (1 V = 1 J/C).
Connecting a load resistor RL across the output of a voltage divider places RL in parallel with R2. This lowers the equivalent bottom resistance, causing the measured output voltage to drop below the theoretical unloaded value—a phenomenon called loading error.
Kirchhoff's Voltage Law states that the algebraic sum of all electric potential differences (voltages) around any closed loop in a circuit must be zero (Σ V = 0), expressing conservation of electrostatic energy.
For a pure sinusoidal AC waveform, the Root-Mean-Square (RMS) voltage is VRMS = Vpeak / √2 ≈ 0.7071 * Vpeak. Standard household mains voltage of 120V RMS has a peak amplitude of approximately 170V.