Home
Back
Electrical Power Formula:
| From: | To: |
The electrical power formula P = V × I describes the relationship between power, voltage, and current in an electrical circuit. This fundamental equation is used to calculate the rate at which electrical energy is transferred by an electric circuit.
The calculator uses the electrical power formula:
Where:
Explanation: This formula shows that electrical power is directly proportional to both voltage and current. When either voltage or current increases, the power increases proportionally.
Details: Calculating electrical power is essential for circuit design, energy consumption analysis, electrical safety assessments, and determining the capacity requirements for electrical components and systems.
Tips: Enter voltage in volts and current in amperes. Both values must be positive numbers greater than zero. The calculator will compute the electrical power in watts.
Q1: What are the units for electrical power?
A: The standard unit for electrical power is the Watt (W). Other common units include kilowatts (kW) and megawatts (MW).
Q2: Can this formula be used for both AC and DC circuits?
A: For DC circuits and AC circuits with purely resistive loads, yes. For AC circuits with reactive components, additional factors like power factor must be considered.
Q3: What is the relationship between power, voltage, and current?
A: Power is the product of voltage and current. This means that for a given power, higher voltage requires lower current, and vice versa.
Q4: How is this formula derived?
A: The formula comes from the definition of power as work done per unit time, combined with the definitions of voltage (energy per charge) and current (charge per time).
Q5: What are practical applications of this formula?
A: Used in electrical engineering, circuit design, appliance power rating, electrical safety calculations, energy consumption analysis, and power system design.