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14 results for “efficiency”

Formulae (14)

\eta = 1 - \frac{T_C}{T_H}

Maximum efficiency of a heat engine.

COP = \frac{Q_C}{W}

Efficiency measure of a refrigerator or heat pump.

\% = \frac{\text{actual}}{\text{theoretical}} \times 100

Efficiency of a chemical reaction.

SA:V = \frac{\text{surface area}}{\text{volume}}

Ratio governing cellular exchange efficiency.

E = \frac{\text{energy at level } n+1}{\text{energy at level } n} \times 100

Energy transfer between trophic levels (~10%).

SA:V = \frac{\text{surface area}}{\text{volume}}

Ratio governing cell exchange efficiency.

\eta = \frac{P_{out}}{P_{in}} \times 100\%

Ratio of useful output to input power.

\eta = \frac{P_{out}}{P_{in}}\times 100

Ratio of useful output to input power.

SR = \dfrac{GS}{\dot{f}}

Distance flown per unit of fuel; maximizing it gives best fuel economy.

C_{D,i} = \dfrac{C_L^2}{\pi e AR}

Drag due to lift, decreasing with higher aspect ratio and span efficiency.

R = \dfrac{V}{c}\dfrac{L}{D}\ln\dfrac{W_i}{W_f}

Maximum range of a jet aircraft from speed, efficiency, L/D and fuel fraction.

IT = \dfrac{COGS}{Average\ Inventory}

How many times inventory is sold and replaced over a period.

ROA = \dfrac{Net\ Income}{Total\ Assets}

How efficiently a company turns its assets into profit.

IT = \frac{COGS}{\text{Avg Inventory}}

How many times inventory is sold per period.