Electronics Math Center
DC circuits, resistors, capacitors, inductors, signals and battery arithmetic. 20 tools with purposes, formulas and worked examples.
Simple mode uses starting defaults for extra scenario controls. Advanced exposes those controls where available. Change an entry, then press Calculate.
Complete truth table
Formula, calculation steps & example
All 20 tools: purposes and formulas
- DC resistor voltage — Use the labeled measurements to calculate dc resistor voltage.
A × B (A, B, C refer to the labeled entries)
- DC resistor current — Use the labeled measurements to calculate dc resistor current.
A ÷ B (A, B, C refer to the labeled entries)
- DC resistor resistance — Use the labeled measurements to calculate dc resistor resistance.
A ÷ B (A, B, C refer to the labeled entries)
- Measured DC power — Use the labeled measurements to calculate measured dc power.
A × B (A, B, C refer to the labeled entries)
- Electrical energy — Use the labeled measurements to calculate electrical energy.
A × B (A, B, C refer to the labeled entries)
- Charge transferred — Use the labeled measurements to calculate charge transferred.
A × B (A, B, C refer to the labeled entries)
- Series resistance sum — Use the labeled measurements to calculate series resistance sum.
A + B + … (A, B, C refer to the labeled entries)
- Conductance from resistance — Use the labeled measurements to calculate conductance from resistance.
A ÷ B (A, B, C refer to the labeled entries)
- Capacitance from charge and voltage — Use the labeled measurements to calculate capacitance from charge and voltage.
A ÷ B (A, B, C refer to the labeled entries)
- Capacitor charge — Use the labeled measurements to calculate capacitor charge.
A × B (A, B, C refer to the labeled entries)
- RC time constant — Use the labeled measurements to calculate rc time constant.
A × B (A, B, C refer to the labeled entries)
- RL time constant — Use the labeled measurements to calculate rl time constant.
A ÷ B (A, B, C refer to the labeled entries)
- Divider lower-resistor fraction — Use the labeled measurements to calculate divider lower-resistor fraction.
A ÷ B (A, B, C refer to the labeled entries)
- Unloaded divider output — Use the labeled measurements to calculate unloaded divider output.
A × B (A, B, C refer to the labeled entries)
- Frequency from measured period — Use the labeled measurements to calculate frequency from measured period.
A ÷ B (A, B, C refer to the labeled entries)
- Pulse duty cycle — Use the labeled measurements to calculate pulse duty cycle.
A ÷ B × 100 (A, B, C refer to the labeled entries)
- Ideal pulse average voltage — Use the labeled measurements to calculate ideal pulse average voltage.
A × B (A, B, C refer to the labeled entries)
- Rated battery energy — Use the labeled measurements to calculate rated battery energy.
A × B (A, B, C refer to the labeled entries)
- Ideal DC battery runtime — Use the labeled measurements to calculate ideal dc battery runtime.
A ÷ B (A, B, C refer to the labeled entries)
- DC conversion efficiency — Use the labeled measurements to calculate dc conversion efficiency.
A ÷ B × 100 (A, B, C refer to the labeled entries)
Definitions and source references
Unit definitions and selected model references:
- Virginia Tech: wing geometry and mean aerodynamic chord
- Aircraft Design course: tail volume definitions
- Prusa: filament and printer calculation references
- NIST: SI defining constants
- NASA: aerodynamic lift models
- Horizon Hobby: product and battery documentation
- Smithsonian: Maya calendar units
- NIST: frequency intervals and cents
- NIST: binary prefixes
- NOAA: nautical miles and knots
- RFC 3021: IPv4 /31 point-to-point links
- MDN: exact integer arithmetic
- NIST: international-foot unit conversions
- NASA/JPL: astronomical unit definitions
- NASA: ideal rocket equation
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