Electrical

Circuits, resistance, voltage, and power

Electrical solvers from AI-Math are free online electrical calculators and homework helpers covering circuits, resistance, voltage, and power. Type a problem or upload an image and the AI returns a clear, step-by-step solution — perfect for electrical homework, exam prep, or self-study from middle school through college. No signup needed; pick a specific topic below to launch its dedicated solver.

Battery Capacity Calculator

Convert battery amp hours to watt hours, size a battery bank for a load, and estimate charge time. Free step-by-step battery capacity calculator.

Battery Life & Runtime Calculator

Free battery runtime calculator with step-by-step solutions. Work out how long a battery lasts from capacity, depth of discharge, inverter efficiency and load.

Circuit Solver

Free circuit solver with step-by-step solutions. Reduce series-parallel networks, apply Kirchhoff's laws and node voltage analysis, and check loaded voltage dividers.

Conductivity to Resistivity Calculator

Free conductivity to resistivity converter with step-by-step solutions. Convert sigma to rho, find resistance from resistivity, and work out the resistivity of a wire.

Series Circuit Diagram Solver

Free circuit diagram solver with step-by-step solutions. Turn a series or series-parallel schematic into equations, find every current and voltage, and check a bridge for balance.

Electric Field Equation Calculator

Free electric field equation calculator with step-by-step solutions. Solve E = kQ/r squared, the Coulomb force equation F = kq1q2/r squared, and F = qE.

Ohm's Law Calculator

Free Ohm's law calculator with step-by-step solutions. Solve V = IR for voltage, current or resistance, and find power with P = VI, P = I²R and P = V²/R.

Resistors in Parallel Calculator

Free parallel resistance calculator with step-by-step solutions. Find total resistance for resistors in parallel, in series, and in combined series-parallel circuits.

Resistivity of Metals Chart & Calculator

Free resistivity chart and calculator with step-by-step solutions. Look up the resistivity of metals, find resistance with R = rho L / A, and correct for temperature.

Resistor Calculator

Free resistor calculator with step-by-step solutions. Find resistance from resistivity with R = rho L / A, combine resistors in series and parallel, and check power ratings.

Series Resistor Calculator

Free series resistor calculator with step-by-step solutions. Add resistors in series, find the voltage drop over each resistor, and size an LED current-limiting resistor.

PCB Trace Width Calculator

Free PCB trace width calculator with step-by-step solutions. Size a trace for current using the IPC-2221 relation, convert copper weight to thickness, and estimate microstrip impedance.

Voltage in Parallel Calculator

Free voltage in parallel calculator with step-by-step solutions. Find branch currents in a parallel circuit, cable resistance from length and cross-section, and loop impedance.