Power Formula:
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Definition: This calculator computes electrical power (watts) from voltage (volts) and current (amps) using Ohm's Law.
Purpose: It helps electricians, engineers, and DIY enthusiasts determine power consumption in electrical circuits.
The calculator uses the formula:
Where:
Explanation: The voltage is multiplied by the current to calculate the power in watts.
Details: Proper power calculation ensures correct circuit design, proper wire sizing, and safe operation of electrical devices.
Tips: Enter the voltage in volts and current in amps. Both values must be > 0.
Q1: What's the difference between watts, volts, and amps?
A: Volts measure electrical pressure, amps measure current flow, and watts measure power (rate of energy consumption).
Q2: What's a typical household voltage?
A: In North America, 120V is standard for most outlets, while 240V is used for large appliances.
Q3: How do I find the current (amps) of a device?
A: Check the device label or specifications, or measure with a multimeter.
Q4: Can I calculate voltage if I know watts and amps?
A: Yes, using V = P/I. We may add this functionality in a future version.
Q5: Does this work for both AC and DC circuits?
A: This simple calculation works for DC and resistive AC loads. For reactive AC loads, power factor must be considered.