Adjust the inputs below. Results update as you type.
4-band resistor: first two bands = digits, third = multiplier, fourth = tolerance. Color order: Black=0, Brown=1, Red=2, Orange=3, Yellow=4, Green=5, Blue=6, Violet=7, Grey=8, White=9. Multiplier: same colors ×1 through ×10⁹. Series: R_total = R₁ + R₂ + ... Parallel: 1/R_total = 1/R₁ + 1/R₂ + ... For two parallel resistors: R = R₁R₂/(R₁+R₂).
Enter any two of voltage (V), current (A), and resistance (Ω). The third is calculated. Power P = V × I.