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Is it low, medium, or high efficiency and why?

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How does the machine work you studied? How does it convert different energies to perform a job?

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Add two photos to your column to show how it looks and how it works.

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Internal Combustion Engines would be considered of low efficiency, since it utilises a mere 25% of its original energy input.

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In many internal-combustion engines, a moving part known as a piston slides up and down in a cylinder. Most car engines have four to eight cylinders. Valves at the top of a cylinder let in fuel and air, and allow burned fuel to escape. Furthermore, at the top of the cylinder is a spark plug. The spark plug ignites, or sets fire to, the fuel.

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A bicycle would be considered highly efficient, because it only wastes 10% of its energy due to the environment and uses 90% of its energy efficiently.

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Usually coal is burned to heat a boiler full of water. The steam then pushes the piston, releasing steam moving the slide value causing kinetic energy. This can be used to power water pumps or trains.

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Over 62 percent of the fuel's energy is lost in the internal combustion engine (ICE); ICE engines are very inefficient at converting the fuel's chemical energy to mechanical energy, losing energy to engine friction, pumping air into and out of the engine, and wasted heat.

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It is a highly efficient machine as 97% of all energy put in is used efficiently

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Human walking is considered to be a low efficient process as it utilizes 24% of the input energy to provide a useful function.

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Steam engines and turbines operate on the Rankin cycle which has a maximum efficiency of 63%.

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An electromagnetic transformer follows the principle that a changing electric current can be used to create another electric current in the presence of a magnetic field. It does this by having a metal coil as an electro magnet with an AC current flowing through the input side and creating either a higher current, lower current, or the same current. This depends on the number of small metal coils around the main metal coil. If the amount of small metal coils on the input and output sides are the same, the current will also stay the same. If the amount of coils in the input side is higher, the current on the output side will be lower and vice versa.

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When the human releases thrust energy on the pedal, the chain of bicycle convert thrust energy mechanic energy and give it to wheels, and while wheel is turning, the mechanic energy convert to kinetic energy.

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Neuron signals sent from the brain tell the muscles to walk. The muscled contract or relax to move the legs in a walking motion. Th energy for walking is stored as fat within the cells then our red blood cells bring oxygen that we breathe in to the ells which breaks down the fat/carbohydrates and releases energy. That energy is used bu the muscle cells. Waste energy is released as lactic acid and heat.

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energy

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Human walking is a low efficiency task, as the body has to do many tasks for movement. 24% of the energy is used to walk, and the other energy is used when the brain sends signals, when the body is cleaning the lactic acid, and the pumping of the heart takes
makes a lot of energy.

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How does the machine work? Where is energy lost/utilised?