Circuit Analysis

Enter any two of voltage $U$, current $I$, or resistance $R$ to instantly solve the third, with simultaneous power output $P = UI$. Covers DC circuit design, resistor selection, and safety verification. Includes unit-prefix conversion hints (mV, kΩ, mA).

Use the current intensity formula $I = Q / t$ to calculate average current from total charge $Q$ passing through a cross-section in time $t$, with reverse solutions for charge and time. Covers capacitor discharge analysis, pulse-current estimation, and conductor sizing.

Use the resistance formula $R = \rho L / A$ to compute conductor resistance from material resistivity $\rho$ (Ω·m), length $L$, and cross-sectional area $A$, with simultaneous conductance output $G = 1/R$. Covers wire sizing, cable voltage-drop analysis, and PCB trace design.

Based on $T = 9550 P / n$, this tool supports three modes: torque from power and speed, power from torque and speed, and speed from power and torque.

Apply Joule''s Law $Q = I^2 R t$ to calculate the heat generated by a conductor from current $I$, resistance $R$, and time $t$, with results in both joules (J) and kilojoules (kJ). Supports reverse solutions for current, resistance, or time. Covers electric-heater design, PCB trace thermal analysis, and overcurrent protection.

Calculate the equivalent resistance of any number of resistors in series or in parallel. When source voltage is provided, the tool also outputs total current, each branch voltage drop (series), and each branch current (parallel). Covers circuit design, bias-network analysis, and voltage-divider verification.

Compute electrical energy using $W = UIt$ from voltage $U$, current $I$, and time $t$, with simultaneous results in joules (J), watt-hours (Wh), and kilowatt-hours (kWh). Covers appliance energy analysis, battery capacity planning, and industrial electricity metering.