🎓 Physics • Electricity
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Current Calculator
Solves electric current flow I in Amperes from voltage and resistance, or electrical power.
Ohm’s Law & Electrical Power Calculator
Enter any 2 known values — the remaining 2 are solved instantly via V = IR and P = VI.
Standard Circuit Presets:
Unit: V
Unit: A
Unit: Ohms (Ω)
Unit: W (J/s)
Dynamic DC Circuit SchematicConventional Current Flow (Clockwise)
Voltage (V)
12 V
Current (I)
2 A
Resistance (R)
6 Ω
Power (P)
24 W
Step-by-Step Derivation
Given: Voltage V = 12 V, Current I = 2 A
1. Resistance: R = V / I = 12 / 2 = 6.0000 Ω
2. Power: P = V × I = 12 × 2 = 24.0000 W
What is Electric Current?
Electric current is the flow rate of electric charge through a conductor, measured in Coulombs per second (Amperes).
Formula & Step-by-Step Calculation
I = V / R
Voltage divided by resistance.
Worked Step-by-Step Examples
Example 1
120 V applied across 240 Ω load
Solution: 0.5 Amperes (500 mA)
• 120 / 240 = 0.5 A
Common Real-World & Academic Use Cases
- ✓ Circuit breaker amperage sizing
- ✓ Wire gauge current capacity
- ✓ Sensor input current
How to Use the Current Calculator
1
Enter V and R
Input Voltage and Resistance.
2
Read Amperes
View calculated current in Amperes.
Frequently Asked Questions
Q: What is an Ampere?
1 Ampere = 1 Coulomb of charge flowing per second.