Ohm’s Law Calculator
Ohm's Law Calculator
Results
Voltage (V):
Current (I):
Resistance (R):
Power (P):
Understanding Ohm's Law: Complete Guide
Ohm's Law is a fundamental principle in electrical engineering that describes the relationship between:
- Voltage (V) - Electrical potential difference
- Current (I) - Flow of electrical charge
- Resistance (R) - Opposition to current flow
The law states that V = I × R (Voltage = Current × Resistance). This relationship forms the basis for most electrical circuit analysis and is essential for understanding electronic devices.
Key Formulas
| Voltage (V) | V = I × R |
| Current (I) | I = V ÷ R |
| Resistance (R) | R = V ÷ I |
Practical Example
If a light bulb with 12Ω resistance operates at 120V:
Current (I) = V/R = 120V ÷ 12Ω = 10A
Application Tips
- Always use standard units (Volts, Amps, Ohms)
- Measure any two values to calculate the third
- Consider power ratings when designing circuits
- Account for temperature effects on resistance
Common Applications
Circuit Design
Calculate voltage drops across components
Troubleshooting
Identify faulty components in electrical systems
