Useful Energy: Energy in the place and form that we need it
Wasted Energy: Energy that isnt useful
Both useful and wasted energy ends up getting transferred to the environment eventually
Efficiency:
- Most energy transfers invlove some loss of energy, often heat
- Efficiency = Useful energy (or power) out / Total energy( or power) in ( x 100 for a % )
- No machine can be more than 100% efficient
- Machines can be made more efficient by decreasing friction, sound, heat etc
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