Calculate resistance (Ω) from V, I, P, or Z in DC and AC circuits using Ohm’s Law. Includes power factor handling for real-world accuracy. “Tendency of a body to oppose the passage of an electric current.” This is the fundamental definition of resistance: the property of a material that resists the
Active power, also known as real power, is the portion of electrical power that performs useful work in a circuit—such as producing heat, light, or mechanical motion. Measured in watts (W) or kilowatts (kW), it represents the actual energy consumed by a load and is the basis for electricity billing.
Calculate power factor (PF) in AC circuits using voltage, current, active power, reactive power, resistance, or impedance. Supports single-phase, two-phase, and three-phase systems. Based on IEC standards for electrical efficiency analysis. Input Parameter Symbol Unit Required Combinations Voltage V
Reactive power is the energy alternately flowing in inductive and capacitive components of an AC circuit without being transformed into other forms of energy. Although it does not perform useful work, it is essential for maintaining voltage stability and system performance. Unit: Volt-Ampere Reactiv
Impedance is the total opposition of a circuit to the flow of alternating electric current, measured in ohms (Ω). It includes resistance, inductive reactance, and capacitive reactance, and is a key parameter in AC circuit analysis. Parameter Description Current Type Select the type of current: Direc
This tool calculates the apparent power (S) in an electrical circuit based on voltage, current, and power factor. It also supports calculation using resistance, impedance, or reactive power depending on available data. Apparent power is the vector sum of active and reactive power: S = √(P² + Q²) Whe
Calculate torque (N·m, ft·lbf) or power (kW, HP) from RPM using the mechanical power-torque-speed relationship. Supports motors, engines, pumps, turbines, and gear systems for engineering design and analysis. This tool calculates torque (T) in rotating mechanical systems using power (P) and rotation
This calculator estimates the theoretical runtime of a battery under a given load. By entering battery configuration and load parameters, you can determine the expected duration of power supply. Parameter Description Connection Select the battery connection type: Series: Voltages add up, capacity re
Calculate the heat energy dissipated in resistive elements of a circuit. "Power dissipated in the form of heat in the resistive elements of the circuit." Key Formula: Joule's Law Q = I² × R × t or Q = P × t Where: Q: Heat energy (joules, J) I: Current (amperes, A) R: Resistance (ohms, Ω) t: Time (se
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