Circuits And Components
Series and parallel circuit calculators for voltage dividers, resistor networks, LED series resistors, shunts, reactance, capacitors, RC timing, and voltage-drop checks.
Electrical Formulas
Voltage, current, resistance, power, energy, power factor, and cost calculators for basic electrical math.
Subcategories
Power, Energy And Cost
Power factor, reactive power, kWh use, time-of-use cost, fuel cost, and energy savings calculations.
Voltage, Current And Resistance
Ohm law, watts, amps, volts, resistance, current, voltage, and DC power calculations.
Published Calculators
Power Factor Calculator
Review power factor and reactive power from real power in kW and apparent power in kVA. This is a screening formula, not a power-quality study.
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Reactive Power Calculator
Review reactive-power change from real power and power-factor inputs. This is a screening calculation, not capacitor-bank or harmonic-filter selection.
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Ohm’s Law Calculator
Solve for voltage, current, resistance, or power from known fixed-resistance electrical values.
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Electricity Cost Calculator
Calculate kWh and cost from power, runtime, billing days, and rate per kWh.
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Energy Use Calculator (kWh from Watts and Time)
Calculate electricity usage in kWh from watts, quantity, hours per day, and number of days.
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Series Circuit Calculator
Calculate total series resistance, circuit current, and individual resistor voltage drops from a fixed DC-style source and three resistance values.
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Shunt Resistor Calculator
Estimate meter-shunt and current-sense resistor values before reviewing power rating, thermal behavior, tolerance, calibration, and instrument requirements.
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Parallel Circuit Calculator
Calculate equivalent resistance, total current, and branch currents for three fixed-resistance branches on a common DC-style voltage basis.
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