Volt to Amp Calculator
Convert voltage in volts (V) to current in amperes (A).
Voltage to Ampere Converter
Common Volt to Amp Conversions
Click on these links to see instant conversions with common values:
Understanding Volt to Amp Conversion
Converting voltage (Volts) to current (Amps) primarily relies on Ohm's Law, which describes the relationship between voltage, current, and resistance in an electrical circuit.
Conversion Formula
Where:
• I = Current in Amperes
• V = Voltage in Volts
• R = Resistance in Ohms
Key Concepts
- Volt (V): The unit of electric potential difference, often thought of as the 'pressure' that pushes electrons.
- Ampere (A): The unit of electric current, representing the flow of electric charge.
- Ohm (Ω): The unit of electrical resistance, representing the opposition to the flow of electric current.
- Ohm's Law: A fundamental law in electrical engineering stating that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them.
Typical Voltage and Resistance Values
| Component/Circuit | Voltage (V) | Resistance (Ω) | Approx. Current (A) |
|---|---|---|---|
| LED (with resistor) | 3 | 150 | 0.02 |
| Small DC Motor | 12 | 24 | 0.5 |
| Incandescent Bulb | 120 | 144 | 0.83 |
| Heating Element | 240 | 24 | 10 |
| Standard Resistor | 5 | 1000 | 0.005 |
Frequently Asked Questions
Can I convert volts to amps without resistance?
No, you cannot directly convert volts to amps without knowing either the resistance (using Ohm's Law) or the power (using the power formula, where Amps = Watts / Volts). Voltage, current, and resistance are interconnected.
What is Ohm's Law?
Ohm's Law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them. It is expressed as V = I × R.