Physics Formula
Ohm's Law Formula Formula
Relates voltage, current, and resistance in an electrical circuit.
Formula Summary
Ohm's Law Formula
Relates voltage, current, and resistance in an electrical circuit.
- Category
- Physics
- Equation
- V = IR
- Calculator
- Use Ohm's Law Formula Calculator →
Equation
V = IR
Variables
- V = voltage
- I = current
- R = resistance
Units
- Voltage: volts (V)
- Current: amperes (A)
- Resistance: ohms (Ω)
When To Use This Formula
Use this formula when analyzing electrical circuits to find voltage, current, or resistance when the other two values are known.
Rearranged Equations
- I = V / R
- R = V / I
How to Use This Formula
- Identify the known values from the problem statement.
- Convert all values into compatible units.
- Substitute the values into the equation and calculate the result.
- Check that the final answer has the correct unit and meaning.