Which power formula should I use?

P = V × I when you know voltage and current, P = I²R when you know current and resistance, P = V² ÷ R when you know voltage and resistance - all three are included.

How are resistor networks handled?

Series adds resistances directly; parallel combines two resistors as R₁R₂ ÷ (R₁ + R₂). The voltage divider also shows the divider current.

Can I estimate my electricity bill?

Yes - the Energy Cost tool multiplies wattage and hours into kWh, then applies your tariff rate per kWh.

What about capacitor and inductor storage?

Capacitor energy = ½CV² and inductor energy = ½LI², both in joules - handy for sizing snubbers and smoothing stages.

Electrical Calculator - Ohm’s Law, Power, Resistors & Energy Cost

Eleven circuit formulas with step-by-step working: Ohm’s law, power in three forms, resistor networks, voltage dividers, charge and stored energy.

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Circuit Math Without the Guesswork

AiLoveKit's electrical calculator covers the everyday circuit toolkit: Ohm's law, all three power forms, total resistance for series and parallel networks, voltage dividers, charge flow and the energy stored in capacitors and inductors.

Practical Extras

Energy cost - turn any appliance's wattage into a running cost at your tariff rate.
Step-by-step - divider currents, kWh usage and intermediate values are shown, not hidden.
Instant - results recompute as you type, ideal for bench work and homework alike.

Need the motion and energy side? The Physics Calculator handles work, power and kinematics with the same transparent steps.