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Glossary

Wh (watt-hour)

A measure of the energy a battery stores. Used for laptops, power banks and airline limits.

Wh (watt-hours) measures energy. It lets you compare batteries with different voltages. Wh = mAh × volts ÷ 1000. Airlines usually allow power banks up to 100 Wh in hand luggage without approval (always check your airline).

Also called: watt hour

More terms

Power supply (PSU)Converts mains power for the PC. Graphics card makers state a recommended PSU wattage.AC charging (kW)Charging from a home wallbox or public AC post. Limited by the car's onboard charger.Boost clock (GHz)The highest speed a CPU or GPU runs for short bursts when cooling and power allow.Megapixels (MP)Millions of pixels in a photo. More MP allows more detail and cropping, but sensor size and processing matter more for quality.Pixel density (ppi)Pixels per inch — how sharp a screen looks. Above ~400 ppi, individual pixels are very hard to see at phone distance.WLTPThe Worldwide Harmonised Light Vehicles Test Procedure — the lab test for official fuel use, CO₂ and EV range in Europe and many other markets.

All glossary terms