Electrical & Circuits
Ohm’s Law, Power, Resistors, Capacitors, Wire Gauge & Energy Cost. All computations happen instantly in your browser with zero latency and zero data transmitted to servers.
Ohm's Law Calculator (V = IR, P = VI)
Calculate voltage, current, resistance, and electrical power with interactive variable solving.
Electricity Cost & Power Consumption Calculator
Calculate electricity consumption in kWh and estimated utility bill cost per day, month, and year.
Circuit Impedance & Power Factor Calculator
Calculate RC time constant, cutoff frequency (-3dB), capacitive reactance, and phase angle for electrical circuits.
Circuits, Ohm’s Law & Electrical Power Calculations
Electrical circuits obey precise mathematical relationships connecting voltage, current, resistance, and wattage. Calculate circuit loads, power consumption, and residential electricity costs.
What You Can Calculate in This Hub
Popular Problem-Solving Workflows
Circuit Design Basics
Determine required resistor ratings and voltage drops across electrical components.
- •Ohm’s Law triangle: Cover the value you need with your finger to reveal the formula (V on top, I and R on the bottom).
- •1 Kilowatt-hour (kWh) equals running a 1,000-Watt appliance for one full hour.
Think of electricity like water in a pipe: Voltage is water pressure, Current is how fast water flows, and Resistance is a narrow pipe slowing it down.
Ohm's Law and Electrical Power: Voltage, Current, Resistance & Wattage Formulas
A reference for Georg Ohm’s fundamental circuit law and Joule’s electrical power equations.