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Power Consumption Calculator
Calculate device power consumption, input power, energy use, electricity cost, and power supply loss from voltage, current, operating time, and efficiency.
Input Parameters
Results
Equations Used
DC Power: P = V × I
Input Power: Pin = Pload / Efficiency
Energy: E(kWh) = P(W) × Hours × Days / 1000
Cost: Cost = Energy × Rate
Loss: Ploss = Pin - Pload
Frequently Asked Questions (FAQ)
Q1: What does a power consumption calculator estimate?
It estimates electrical power, input power, energy use, cost, and losses from voltage, current, operating time, and efficiency.
Q2: Should I use average or peak current?
Use average current for energy and battery/runtime estimates. Use peak current for fuse, wire, and transient design checks.
Q3: Why does efficiency matter?
A power supply draws more input power than the load consumes. The difference becomes heat and affects energy cost and thermal design.
Q4: Can I use this for AC loads?
Yes for simple power estimates if real power or RMS voltage/current with power factor is known. For AC systems, use a power factor or three-phase calculator when needed.
Q5: Is watt-hour the same as watt?
No. Watt is power at an instant; watt-hour is energy over time.
Q6: Why is measured power different from calculated V×I?
Real systems may have switching loads, AC power factor, inrush current, duty cycling, and supply efficiency changes.
