Power Converter

An 800 W microwave draws 1,300 W. A 2,000 W air conditioner averages 600 W. Input, output, apparent and average power are four different things called watts.

The duck curve — the dramatic midday dip and evening ramp that high solar penetration creates in net electrical demand — is one of the core grid stability challenges of the renewable energy transition. Here's what power quality actually means (voltage regulation, frequency stability, harmonic distortion), why grid-scale batteries are valued for power capacity (MW) not energy capacity (MWh), and how declining grid inertia from solar and wind threatens frequency response.

Power (watts) is a rate — how fast energy flows. Energy (watt-hours) is an amount accumulated over time. An 8.5kW electric shower used 8 minutes daily costs about £99/year; a 60W refrigerator running 24/7 costs about £126/year — the lower-power device costs more annually because it runs continuously. Here's the correct appliance running cost formula, why nameplate wattage overstates actual consumption, and the grid-scale context for MW, GW, and TW.

A UPS rated "1000VA" and a power supply rated "1000W" sound like the same quantity — they're not. VA (apparent power) and W (real power) differ by the power factor, and many common devices have power factors well below 1.0, meaning a "1000VA" UPS often can't actually support 1000W of real load. Here's what power factor means, why UPS units are rated in VA in the first place, why "naive" sizing (treating VA and W as interchangeable) can leave far less headroom than expected, and how active PFC closes the gap in modern equipment.

Professional cyclists sustain 400+ watts — and W/kg (watts per kilogram) determines who wins on climbs. Here's FTP and power training zones, how cycling power meters work, human power output in different sports, and why mechanical efficiency means 250W of cycling burns 850 kcal/hour metabolically.