Watt Volt Amp Calculator
Calculate any unknown value (Watts, Volts, Amps) using Ohm's Law and Power formulas.
Calculate Electrical Values
Common Watt Volt Amp Scenarios
Click on these links to see instant calculations with common values:
Understanding Watt, Volt, and Ampere
Watts, Volts, and Amperes are fundamental units in electrical engineering, describing power, electrical potential, and current, respectively. They are interconnected by Ohm's Law and the power formula.
Formulas
Voltage (Volts): V = P / I
Current (Amps): I = P / V
Where:
• P = Power in Watts
• V = Voltage in Volts
• I = Current in Amperes
Key Concepts
- Watt (W): The unit of electrical power, representing the rate at which energy is consumed or produced.
- Volt (V): The unit of electric potential difference, representing the electrical 'pressure' that drives the current.
- Ampere (A): The unit of electric current, representing the flow of electric charge.
Typical Values for Common Appliances
| Appliance | Power (Watts) | Voltage (Volts) | Current (Amps) |
|---|---|---|---|
| LED Light Bulb | 10 | 120 | 0.08 |
| Laptop Charger | 60 | 120 | 0.5 |
| Microwave Oven | 1000 | 120 | 8.33 |
| Hair Dryer | 1800 | 120 | 15 |
| Electric Kettle | 2200 | 240 | 9.17 |
Frequently Asked Questions
What is the relationship between Watts, Volts, and Amps?
These three are fundamental to understanding electricity. Watts (power) is the product of Volts (electrical pressure) and Amps (current flow). Knowing any two allows you to calculate the third.
Can this calculator be used for AC and DC circuits?
This calculator uses the basic power formula (P=V*I) which is directly applicable to DC circuits and purely resistive AC circuits. For AC circuits with inductive or capacitive loads, a power factor would need to be considered, making the calculations more complex.