⚡ Electricity & Magnetism Calculators
Circuits, fields, capacitors, inductors and AC power. Browse 78 free electricity & magnetism calculators, each with the formula, a worked example and an interactive chart.
Ohm's Law CalculatorFind voltage, current or resistance and power in a circuit.Electric Power CalculatorCompute electrical power from voltage and current.Electricity Cost CalculatorEstimate energy use and running cost of an appliance.Resistors in Series CalculatorTotal resistance of resistors connected in series.Resistors in Parallel CalculatorEquivalent resistance of resistors in parallel.Voltage Divider CalculatorFind output voltage of a two-resistor divider.Current Divider CalculatorSplit current between two parallel branches.LED Resistor CalculatorChoose the series resistor for an LED.Capacitor Energy CalculatorFind energy and charge stored in a capacitor.Capacitors in Series and Parallel CalculatorCombine capacitors to find total capacitance.RC Time Constant CalculatorFind time constant and charge time of an RC circuit.RL Time Constant CalculatorFind the time constant of an inductor circuit.LC Resonant Frequency CalculatorFind resonant frequency of an LC circuit.Inductive and Capacitive Reactance CalculatorCompute reactance of an inductor and capacitor at a frequency.Series RLC Impedance CalculatorFind impedance, current and phase angle of a series RLC circuit.Coulomb's Law CalculatorCompute electric force between two charges.Electric Field of a Point Charge CalculatorFind electric field strength and potential at a distance from a charge.Parallel Plate Capacitor CalculatorFind capacitance from plate area and gap.Magnetic Field of a Straight Wire CalculatorFind magnetic field at a distance from a current-carrying wire.Solenoid Magnetic Field CalculatorCompute magnetic field inside a solenoid.Magnetic Force on a Moving Charge CalculatorFind the force on a charge moving in a magnetic field.Cyclotron Radius CalculatorFind radius and frequency of a charged particle in a magnetic field.Faraday's Law (Induced EMF) CalculatorCompute induced emf from changing magnetic flux.Transformer CalculatorFind secondary voltage and current of an ideal transformer.AC Voltage RMS and Peak CalculatorConvert between peak, RMS and peak-to-peak voltage.Power Factor CalculatorFind real, reactive and apparent power in an AC circuit.Three-Phase Power CalculatorCompute power in a three-phase system.Battery Life CalculatorEstimate how long a battery will last.Wire Resistance CalculatorCompute resistance and voltage drop of a wire.Resistor Tolerance Range CalculatorFind minimum and maximum resistance from value and tolerance.Wheatstone Bridge CalculatorFind the unknown resistance of a balanced bridge.Two-Source Node Voltage CalculatorFind node voltage of two sources feeding one load.Electron Drift Velocity CalculatorCompute drift velocity of electrons in a wire.Joule Heating CalculatorFind heat produced by current in a resistor.RC Filter Cutoff Frequency CalculatorFind the cutoff frequency of an RC low-pass or high-pass filter.Skin Depth CalculatorFind how deep AC current penetrates a conductor.Electric Potential Energy CalculatorEnergy of two point charges at a separation.Inductor Energy CalculatorFind energy stored in an inductor.Solenoid Inductance CalculatorFind inductance of an air-core solenoid.Mass Spectrometer Radius CalculatorFind the path radius of an ion in a mass spectrometer.Charge, Current and Time CalculatorRelate charge, current and time.Capacitor Dielectric Breakdown Voltage CalculatorEstimate breakdown voltage across an insulating gap.Capacitive Reactance CalculatorFind the opposition a capacitor presents to alternating current at a given frequency.Battery Amp-Hours to Energy CalculatorConvert a battery capacity in amp-hours and its voltage into stored energy in watt-hours.Magnetic Flux CalculatorFind the magnetic flux through a loop from the field strength, area and angle.Motional EMF CalculatorFind the voltage and current induced in a conductor moving through a magnetic field.Hall Effect Voltage CalculatorEstimate the Hall voltage across a conductor carrying current in a magnetic field.Force on a Current-Carrying Wire CalculatorFind the magnetic force on a wire carrying current across a magnetic field.Electric Field from Voltage CalculatorFind the uniform electric field between two plates from the voltage and the gap.Coaxial Cable Capacitance CalculatorFind the capacitance per cable length of a coaxial cable from its radii and insulator.Coaxial Cable Inductance CalculatorFind the self inductance of a coaxial cable from its length and conductor radii.Resistor Power Dissipation CalculatorFind the power a resistor turns into heat and a safe power rating to choose.Battery Terminal Voltage Under Load CalculatorFind how much voltage a battery delivers under load given its internal resistance.Battery Pack Series and Parallel CalculatorFind the voltage, capacity and energy of a battery pack built from identical cells.Cable Voltage Drop CalculatorFind the voltage lost along a copper cable carrying a load over its length.PWM Average Voltage CalculatorFind the average voltage delivered by a pulse width modulated signal at a duty cycle.Series RLC Quality Factor CalculatorFind the resonant frequency, quality factor and bandwidth of a series RLC circuit.Electric Potential of a Point Charge CalculatorFind the electric potential at a distance from a point charge.Electronvolt Energy ConverterConvert an energy in electronvolts into joules and an equivalent frequency.Magnetic Field at Centre of a Coil CalculatorFind the magnetic field at the centre of a circular coil with several turns.Power Factor Correction CalculatorFind the reactive power a capacitor bank must supply to raise a load power factor.DC Motor Back EMF CalculatorFind the back EMF and developed power of a DC motor from supply voltage and armature current.Magnetic Energy Density CalculatorFind the energy stored per cubic metre in a magnetic field.Electric Field Energy Density CalculatorFind the energy stored per cubic metre in an electric field in a dielectric.Bridge Rectifier Output CalculatorEstimate the peak and average DC output of a bridge rectifier after diode drops.Capacitor Stored Charge CalculatorFind the charge stored on a capacitor at a given voltage.RC Circuit Charging Voltage CalculatorFind the capacitor voltage at a given time while charging through a resistor.RL Circuit Current Growth CalculatorFind the current in an inductor circuit at a given time after switching on.RC Discharge Time CalculatorFind how long a capacitor takes to discharge down to a threshold voltage.Ammeter Shunt Resistor CalculatorFind the shunt resistor that extends a meter movement to a larger full-scale current.Voltmeter Multiplier Resistor CalculatorFind the series resistor that extends a meter movement to a higher voltage range.Electric Motor Efficiency CalculatorFind the efficiency of an electric motor from its electrical input and mechanical output.Battery Charge Time CalculatorEstimate how long it takes to charge a battery at a given charging current and efficiency.Generator Peak EMF CalculatorFind the peak voltage and frequency of a rotating coil generator.Resistance Change with Temperature CalculatorFind how a resistor or wire changes resistance when its temperature changes.RC Discharge Current CalculatorFind the starting discharge current of a capacitor through a resistor and its current at a later time.Electric Field of a Line Charge CalculatorFind the electric field a distance from a long, uniformly charged line.LED String Count and Resistor CalculatorFind how many LEDs fit in series on a supply and the resistor needed for the string.
About Electricity & Magnetism calculators
Circuits, fields, capacitors, inductors and AC power. CalcDepo has 78 free electricity & magnetism calculators. Each one shows the formula, the variables and their units, a worked example and a chart of how the result changes, so you can check homework, plan a lab or understand the idea behind the numbers.
Popular calculators here include Ohm's Law, Electric Power, Electricity Cost, Resistors in Series, Resistors in Parallel, Voltage Divider. Common searches in this category include “volts amps ohms”, “watts from volts and amps”, “how much does it cost to run”, “add resistors”.
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