Electrical Calculator
Professional electrical calculations for circuits and power systems
Quick answer
Electrical Calculator
Calculate voltage, current, resistance, and power using Ohm's Law and power formulas. Essential for electrical work and circuit analysis.
Formula
V = I Ć R (Ohm's Law), P = V Ć I (Power)
ā” Electrical Calculations
š Results
Enter values and click Calculate to see results
ā” Quick Reference
Ohm's Law: V = I Ć R
Power: P = V Ć I = IĀ²R = VĀ²/R
Energy: E = P Ć t (Wh or kWh)
Note: Enter any 2 values to calculate the rest
ā”Formula
V = I Ć R (Ohm's Law), P = V Ć I (Power)š”How it works
Calculate voltage, current, resistance, and power using Ohm's Law and power formulas. Essential for electrical work and circuit analysis.
ā¹ļø What is Electrical Calculator?
An electrical calculator applies fundamental electrical laws ā Ohm's Law, Watt's Law, and Kirchhoff's Laws ā to compute voltage, current, resistance, and power in circuits. It is used by electricians, engineers, students, and hobbyists for sizing wires, fuses, and components.
š Formula
āļø Worked Example
- 1Current: I = V / R = 120 / 60 = 2 A
- 2Power: P = V Ć I = 120 Ć 2 = 240 W
- 3Check: P = IĀ²R = 4 Ć 60 = 240 W ā
š” How to Interpret Results
- āøIf current Ć resistance drops across all components sum to supply voltage (Kirchhoff's Voltage Law).
- āøHigher resistance means lower current for the same voltage ā useful for limiting current to LEDs and components.
- āøPower dissipated as heat in a resistor: higher I and higher R both increase heat (P = IĀ²R).
- āøFor AC circuits, use impedance (Z) instead of pure resistance for power factor corrections.
- āøAlways verify wire gauge can handle the calculated current ā undersized wire overheats and is a fire hazard.
ā Frequently Asked Questions
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