Theory & Formula
Ohm's Law states that the electric current flowing through a conductor is directly proportional to the voltage applied across it and inversely proportional to its resistance, provided the temperature remains constant.
Primary Formula:
V = I × R
Where:
• V = Voltage (Volts)
• I = Current (Amperes)
• R = Resistance (Ohms)
• V = Voltage (Volts)
• I = Current (Amperes)
• R = Resistance (Ohms)
Rearranged Formulas:
I = V ÷ R
R = V ÷ I
Key Relationships
| Quantity | Symbol | Unit |
|---|---|---|
| Voltage | V | Volt (V) |
| Current | I | Ampere (A) |
| Resistance | R | Ohm (Ω) |
💡 Remember: Increase voltage → Current increases. Increase resistance → Current decreases.
Ohm's Law Triangle
How to use: Cover the unknown quantity to find the correct formula
Calculator
volts
amperes
ohms
📝 How to use: Enter any two values and click Calculate to find the third value.