Calculate it. Understand it. Verify it.
NodeAndVolt is growing into a transparent engineering computation platform for power systems, circuits, signals, controls, electromagnetics, DSP, energy, and engineering school.
16 featured tools shown.
NodeAndVolt Workbench
Search by problem statement, jump to the right calculator, and review your recent calculations directly in the browser.
Explore by Discipline
Power Systems
Three-phase systems, transformers, motors, generation, fault analysis, and distribution.
16 tools availableCircuits and Electronics
Ohm's law, components, transient response, and practical electronics.
7 tools availableSignals and Systems
Waveforms, reactance, resonance, frequency response, and transforms.
4 tools availableEnergy and Renewables
Batteries, solar, energy conversion, efficiency, and cost.
4 tools availableStudent Toolkit
Weighted grades, GPA, references, and future math helpers.
2 academic toolsControls, DSP, and EM
Transfer functions, sampling, filters, fields, waves, and transmission lines.
Next expansion areasFeatured Tools
3-Phase Power
Calculate balanced kW and kVA.
Bulk powerBulk Power MVA and Amps
Convert between line MVA and current.
Fault analysisTransformer Fault Current
Estimate terminal current from percent impedance.
Power flowMW, MVAR, MVA, and PF
Solve real, reactive, and apparent power.
Power systemsTransformer kVA
Calculate transformer apparent power.
MachinesMotor FLA
Estimate motor running current.
CircuitsOhm's Law
Calculate V, I, R, and P.
ElectronicsResistor Color Code
Decode 4-band and 5-band values.
DistributionVoltage Drop
Estimate conductor loss.
SignalsLC Resonance
Find ideal resonant frequency.
SignalsWaveform Conversion
Convert RMS, peak, and peak-to-peak.
MathMath Solver
Scientific math, trig, derivative, and integral tools.
EnergyBattery Runtime
Estimate stored-energy duration.
EnergySolar Array Sizing
Estimate array power and panel count.
StudentsWeighted Grade Calculator
Calculate current and required grades.
StudentsGPA Calculator
Calculate term and cumulative GPA.
Recent Calculations
Calculators and Guides Work Together
Transparent math
See formulas and substituted values rather than an unexplained answer.
Companion guides
Relevant calculators link directly to theory, assumptions, and common mistakes.
Privacy by default
Inputs run locally. Location is not requested, and student data is not preloaded or submitted.
Frequently Asked Questions
What can I calculate here?
Power, fault current, transformer sizing, voltage drop, resistor values, batteries, solar, math, and school-grade tools.
Why does this help search?
The site is organized by discipline with clear titles, descriptions, internal links, and supporting guides.
Will new tools keep getting added?
Yes. The structure is meant to scale into more power, signals, controls, DSP, and math tools.
Can I trust the answers?
The tools are meant for educational and estimation use. Verify final values against applicable codes and equipment ratings.