Efficiency, abbreviated as \(\eta\) (Greek symbol eta), a dimensionless number, is expressed in percentage and always less than 100%. Efficiency is a measure of how effectively a system or process converts inputs into outputs. It quantifies the ratio of useful output or work obtained from a system to the total input or energy supplied to the system. In general, efficiency is a measure of how well a system performs in achieving its intended purpose while minimizing waste or losses.
Energy Efficiency Formula |
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\( \eta \;=\; \left( \dfrac{ E_o }{ E_i } \right) \cdot 100 \) (Energy Efficiency) \( E_o \;=\; \dfrac{ \eta \cdot E_i }{ 100 }\) \( E_i \;=\; \dfrac{ E_o \cdot 100 }{ \eta }\) |
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| Symbol | English | Metric |
| \( \eta \) (Greek symbol eta) = Energy Efficiency | \(dimensionless\) | \(dimensionless\) |
| \( E_o \) = Output Energy | \(ft-lbf\) | \(J\) |
| \( E_i \) = Input Energy | \(ft-lbf\) | \(J\) |
Efficiency is an important factor in various fields, including energy production, manufacturing, transportation, and sustainability. Improving efficiency can lead to reduced waste, increased productivity, cost savings, and a more sustainable use of resources.
Work Efficiency Formula |
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\( \eta \;=\;\left( \dfrac{ W_o }{ W_i } \right) \cdot 100 \) (Work Efficiency) \( W_o \;=\; \dfrac{ \eta \cdot W_i }{ 100 }\) \( W_i \;=\; \dfrac{ W_o \cdot 100 }{ \eta }\) |
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| Symbol | English | Metric |
| \( \eta \) (Greek symbol eta) = Work Efficiency | \(dimensionless\) | \(dimensionless\) |
| \( W_o \) = Output Work | \(ft-lbf\) | \(J\) |
| \( W_i \) = Input Work | \(ft-lbf\) | \(J\) |