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P1, P2, P3: ENERGY - Coggle Diagram
P1, P2, P3: ENERGY
CONSERVATION OF ENERGY
The law of the conservation of energy states that energy can neither be created nor destroyed. It can only be transferred.
CHANGES IN ENERGY STORES
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Energy can be transferred from one store to another. When a ball falls, its GPE is converted into KE
Power, Work and Efficiency
Work is the amount of force applied over a distance. Its equivalent to energy transferred:
work = force x distance
Power is the rate at which energy is transferred. One Watt is 1 joule of energy transferred every second.
power = energy/time
Dissipation of energy
When energy is transferred, some energy is always wasted. For example, when converting electrical energy into light energy in a bulb, thermal energy is also produced. This is called the dissipation of energy.
Efficiency is the amount of useful energy transferred as a percentage of the total input energy. Its calculated using:
Efficiency = useful energy/total input energy
Nothing can ever be 100% efficient because you can't have more energy than what you start with. To improve efficiency, you can tighten moving parts, lubricate gears and machinery, insulate wires and streamline shapes.
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