⚡ Electricity

4 calculators in this category.

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Calculators for current electricity and electrostatics: Ohm's law, electric power and energy cost in units (kWh), equivalent resistance of series and parallel circuits, and the force between charges.

Find voltage, current or resistance with Ohm's law V = IR, plus the power in watts. Enter any two values.

Electric Power & Cost

Calculate electric power P = VI in watts from voltage and current, then the energy used in kWh (units) and its cost for your daily usage and tariff.

Series & Parallel Resistors

Find the total (equivalent) resistance of up to five resistors connected in series or in parallel. Unused boxes can be left as 0.

Calculate the electrostatic force between two point charges with Coulomb's law F = kq₁q₂/r². Charges in microcoulombs; positive answers repel, negative attract.