Tagged
efficiency
20263 articles
How a Heat Pump Moves Heat Instead of Making It
A heat pump uses electricity to carry heat from a cold place to a warm one. Here is the four-step refrigerant cycle and what its coefficient of performance means.
How LED Bulbs Make Light and Why They Last So Long
LED bulbs turn electric current into light far more efficiently than old filament bulbs. Learn how white light is made, how long LEDs last, and why heat matters.
What Bypass Ratio Means in a Jet Engine
Bypass ratio compares the air going around a jet engine's core with the air going through it. Here is why airliners use high ratios and fighters do not.