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13 cards from this deck
How well a device converts input energy to useful energy
Wastes little energy
Wastes most of its input energy
Dissipated as heat in the surroundings
Useful energyTotal energy×100%\frac{\text{Useful energy}}{\text{Total energy}} \times 100\%Total energyUseful energy×100%
Joules (J)
Less than 100%
Law of conservation of energy - energy cannot be created
Reduces friction between moving parts, preventing heat loss
Reduces dissipation of thermal energy to surroundings
Friction from moving parts and air resistance
Total=Useful Output+Wasted Energy\text{Total} = \text{Useful Output} + \text{Wasted Energy}Total=Useful Output+Wasted Energy
Streamline shapes
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