Electricity Calculator Group

Electrical Fundamentals Calculators

Work with voltage, current, resistance, charge, materials, and basic direct-current relationships.

Choose the electrical result you need

Use measured values and keep prefixes such as milli, kilo, and mega consistent before calculating.

Open the calculator whose primary output matches the decision at hand. Each worksheet shows its formula, loaded example, input definitions, limitations, and related calculations.

Electrical Fundamentals worksheets

Ohm's LawFind voltage and power from current and resistance.Electric PowerCalculate electrical power from voltage and current.Electrical EnergyConvert power and operating time into energy.Charge Current TimeFind transferred electric charge.Electron FlowEstimate the number of electrons represented by a current.Electrical ConductanceConvert resistance into conductance.Material ResistivityDetermine resistivity from a uniform specimen.Conductor ResistanceEstimate resistance from material and geometry.Current DensityCalculate current per unit conductor area.Electric Field StrengthEstimate a uniform electric field between electrodes.Series ResistanceCombine three resistors connected in series.Parallel ResistanceCombine three resistors connected in parallel.Voltage DividerFind the unloaded voltage-divider output.Loaded Voltage DividerInclude a finite load in a voltage divider.Current DividerSplit current between two resistive parallel branches.Source Internal ResistanceEstimate source resistance from loaded voltage sag.Maximum Power TransferFind the resistive load for maximum power transfer.Joule HeatingCalculate resistive heat produced over time.Resistance TemperatureApply a linear resistance temperature coefficient.Shunt ResistorSize an ideal current-measurement shunt.

Use ratings and measurements deliberately

Keep voltage type, current path, frequency, phase arrangement, operating time, and temperature with the result. A value taken from a nameplate may describe a different condition from a meter reading.

These calculators support arithmetic and comparison. They do not replace electrical codes, equipment instructions, qualified design, safe isolation, or test procedures.