What is Resistance?

Electrical resistance is the opposition to current flow and is measured in ohms (Ω). Materials like copper have low resistance, while rubber has high resistance.

Ohm’s Law

• R = V / I
• R = V² / P
• R = P / I²

Why Use Resistance Calculator

• Circuit design
• Troubleshooting electronics
• Educational purposes
• Power calculations

AC vs DC

DC resistance is constant while AC uses RMS values.

Units

• 1 kΩ = 1000 Ω
• 1 MΩ = 1,000,000 Ω