Power Formula:
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Definition: This calculator determines electrical power in watts from voltage and current values.
Purpose: It helps electricians, engineers, and DIY enthusiasts calculate power consumption or generation in electrical circuits.
The calculator uses Ohm's power formula:
Where:
Explanation: The voltage (potential difference) multiplied by the current (electron flow) gives the power (energy per unit time).
Details: Accurate power calculations ensure proper circuit design, component selection, and electrical safety.
Tips: Enter the voltage in volts and current in amps. Both values must be positive numbers.
Q1: What's the difference between watts and volt-amps?
A: Watts represent real power, while volt-amps represent apparent power. They're equal in DC circuits or AC circuits with purely resistive loads.
Q2: Can I calculate current if I know power and voltage?
A: Yes, use I = P/V. Our calculator focuses on finding power from voltage and current.
Q3: What's a typical household voltage?
A: In North America, 120V for most circuits and 240V for large appliances. Europe uses 230V.
Q4: How does this relate to energy consumption?
A: Energy (kWh) = Power (kW) × Time (hours). This calculator gives instantaneous power.
Q5: Can I use this for three-phase power calculations?
A: This is for single-phase DC or AC. Three-phase requires multiplying by √3 and power factor.