Ohm's Law Current Calculator
Calculate electrical current using Ohm's law formulas
Electrical Current Calculator
Choose the calculation method based on available values
Electrical potential difference
Opposition to current flow
Calculation Results
Current (I)
Complete Circuit Analysis
Safety Classification
Wire Gauge Recommendation
Formula used: I = V/R
Calculation: I = 12.00 V ÷ 100.00 Ω = 0.1200 A
Current classification: Small devices, logic circuits
Electrical Analysis
Example Calculation
Example: Hair dryer current calculation
Given:
• Power (P) = 1500 W
• Voltage (V) = 120 V
• Find: Current (I)
Solution Steps
Using Ohm's Law: I = P / V
I = 1500 W ÷ 120 V
I = 12.5 A
The hair dryer draws 12.5 amperes of current.
Ohm's Law Formulas
Current Safety Levels
Typical Current Values
Electrical Safety Tips
Always turn off power before working on circuits
Use proper wire gauge for expected current
Include 25% safety margin in calculations
Install appropriate circuit protection
Understanding Ohm's Law and Current
What is Electrical Current?
Electrical current is the flow of electric charge through a conductor. It represents the amount of electric charge passing through a cross-section of a conductor per unit time. Current is measured in amperes (A), where 1 ampere equals 1 coulomb of charge per second.
Ohm's Law Fundamentals
- •Basic Law: I = V/R (Current = Voltage ÷ Resistance)
- •Power Relation: I = P/V (Current = Power ÷ Voltage)
- •Alternative: I = √(P/R) (Current = √(Power ÷ Resistance))
- •Units: Amperes (A), Milliamperes (mA), Microamperes (μA)
Practical Applications
Circuit Design:
• Calculate wire gauge requirements
• Size circuit breakers and fuses
• Determine component ratings
Troubleshooting:
• Diagnose electrical problems
• Verify proper operation
• Check for overloads
Safety Considerations
- Low Current (< 1 mA): Generally safe, used in electronics
- Moderate Current (1-100 mA): Can be dangerous, causes muscle control loss
- High Current (> 100 mA): Life-threatening, can cause cardiac arrest
- Wire Sizing: Use appropriate gauge for current carrying capacity