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14 cards from this deck
How much useful energy out vs total energy in
useful energytotal energy×100%\frac{\text{useful energy}}{\text{total energy}} \times 100\%total energyuseful energy×100%
No units (it's a percentage)
Less than 100%
Temp difference, wall thickness, thermal conductivity
Faster energy transfer
Slower energy transfer
How well a material lets thermal energy pass through it
Good conductor of energy (like metals)
Poor conductor, good insulator (like wood)
Friction in moving parts
Energy lost as heat in electrical circuits
Air resistance for moving objects
Heat
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