Advanced Ohm's Law Calculator

Complete electrical calculations with circuit analysis, power calculations, and component selection

Basic Calculator
Circuit Analysis
Power Calculations
Component Selection

Input Parameters

Results & Visualization

V R I P
Voltage
--
V
Current
--
A
Resistance
--
Ω
Power
--
W
V = I × R, P = V × I

Current vs Voltage Relationship

Circuit Configuration

Volts (V)

Circuit Analysis Results

Total Resistance
--
Ω
Total Current
--
A
Total Power
--
W
Voltage Drop
--
V

Circuit Analysis Formulas

  • Series Circuit: Rtotal = R₁ + R₂ + R₃ + ...
  • Parallel Circuit: 1/Rtotal = 1/R₁ + 1/R₂ + 1/R₃ + ...
  • Current (Series): I = V / Rtotal (same through all components)
  • Current (Parallel): Itotal = I₁ + I₂ + I₃ + ...
  • Voltage Drop (Series): Vn = I × Rn
  • Power Dissipation: P = I² × R = V² / R

Power Calculations

Volts (V)
Amperes (A)
Hours
$ per kWh

Energy & Cost Results

Power Consumption
--
W
Energy Used
--
kWh
Cost per Day
--
$
Cost per Month
--
$

Resistor & Component Selection

Ohms (Ω)
Watts (W)

Recommended Components

Standard Resistor Values (E12 Series)

10, 12, 15, 18, 22, 27, 33, 39, 47, 56, 68, 82 (multiplied by 10ⁿ)

Power Ratings: ¼W (0.25W), ½W (0.5W), 1W, 2W, 5W, 10W

Color Codes: Brown(1), Red(2), Orange(3), Green(5), Blue(6), Violet(7)

Ohm's Law Triangle

V I R × ÷
V = I × R
I = V ÷ R
R = V ÷ I

Power Triangle

P V I × ÷
P = V × I
V = P ÷ I
I = P ÷ V
P = I² × R = V² ÷ R