Electrical Calculator

Professional electrical calculations for circuits and power systems

āš” Electrical Calculations

šŸ”Œ Results

Enter values and click Calculate to see results

āš” Quick Reference

Ohm's Law: V = I Ɨ R

Power: P = V Ɨ I = IĀ²R = VĀ²/R

Energy: E = P Ɨ t (Wh or kWh)

Note: Enter any 2 values to calculate the rest

āš”Formula

V = I Ɨ R (Ohm's Law), P = V Ɨ I (Power)

šŸ’”How it works

Calculate voltage, current, resistance, and power using Ohm's Law and power formulas. Essential for electrical work and circuit analysis.

ā„¹ļø 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.

šŸ“ Formula

Ohm's Law: V = I Ɨ R | Power: P = V Ɨ I = IĀ² Ɨ R = VĀ² / R
Vā€” Voltage in volts (V)
Iā€” Current in amperes (A)
Rā€” Resistance in ohms (Ī©)
Pā€” Power in watts (W)

āœļø Worked Example

Voltage: 120 V
Resistance: 60 Ī©
  1. 1Current: I = V / R = 120 / 60 = 2 A
  2. 2Power: P = V Ɨ I = 120 Ɨ 2 = 240 W
  3. 3Check: P = IĀ²R = 4 Ɨ 60 = 240 W āœ“
āœ… Result: Current = 2 A | Power = 240 W

šŸ’” How to Interpret Results

  • ā–øIf current Ɨ resistance drops across all components sum to supply voltage (Kirchhoff's Voltage Law).
  • ā–øHigher resistance means lower current for the same voltage ā€” useful for limiting current to LEDs and components.
  • ā–øPower dissipated as heat in a resistor: higher I and higher R both increase heat (P = IĀ²R).
  • ā–øFor AC circuits, use impedance (Z) instead of pure resistance for power factor corrections.
  • ā–øAlways 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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