The TRIAC is an ideal device to use for AC switching applications because it can control the current flow over both halves of an alternating cycle. A thyristor is only able to control them over one half of a cycle. During the remaining half no conduction occurs and accordingly only half the waveform can be utilised. Typical / idealised TRIAC & thyristor switching waveforms The fact that the TRIAC can be used to control current switching on both halves of an alternating waveform allows much better
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acids molecules that have a pH level less than 7‚ dissociate in water‚ and release hydrogen ions (H+) action potential the electrical potential determined by unequal ion distribution when a particular site on the neuron membrane is conducting an impulse; normally about +40 millivolts activation energy the amount of energy required before a chemical reaction can occur; this amount is reduced when an enzyme is present active process a biological process (e.g. action potential of neurons) that requires
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Effect of Exercise on Heart Rate. Aim: The aim of this experiment is to find out how different intensities of exercise effect the heart rate I will measure it in beats per minute using a polar heart rate monitor. Hypothesis: I predict that as I increase the intensity of the exercise I do‚ that my heart rate will increase. This is because as I exercise more intensely I will need more blood to my muscles to supply oxygen and take away carbon dioxide; therefore my heart is going to have to beat
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Arrhythmias Arrhythmias are any change from the normal sequence of the electrical impulses in the heart. An arrhythmia is when your heart cannot pump blood effectively. It may happen to fast‚ to slowly‚ or it may happen erratically. When arrhythmias occur; the lungs‚ brain‚ and other organs cannot work properly and they may shut down and be damaged. A normal heart beat is strong‚ muscular pump that is a little larger than a fist and pumps blood continuously through the circulatory system. Arrhythmias
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Cl 242 Tutorial 1: Conduction 1. The rear window of an automobile is defogged by attaching a thin heating element to its inner surface. By electrically heating the element‚ a uniform heat flux may be established at the inner surface. For 4 mm thick window glass‚ determine the electrical power required per unit window area to maintain an inner surface temperature of 150C when the interior air temperature and convection coefficient are Ti = 25 0C and hi = 10 W/m2.K‚ while the exterior (ambient )
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There are some simple ways to reduce heat loss‚ including fitting carpets‚ curtains and draught excluders. Heat loss through windows can be reduced using double glazing. The gap between the two panes of glass is filled with air. Heat loss through conduction is reduced‚ as air is a poor conductor of heat. Heat transfer by convection currents is also reduced by making the gap is very narrow. Heat loss through walls can be reduced using cavity wall insulation. This involves blowing insulating material
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kiln formed between the cylinder and the wheel with natural ventilation channels. Strengthen the heat‚ on the other hand reduces the round with the heat conduction from the cement kiln body‚ making the round with the outer edge of the temperature difference is smaller. Strengthen the heat‚ on the other hand reduces the round with the heat conduction from the lime kiln body‚ making the round with the outer edge of the temperature difference is smaller. When the lime kiln thermal changes in the system
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of South America‚ and increases the temperature of the water in the eastern Pacific. - Temperature‚ Humidity‚ Precipitation‚ Air Pressure and Wind are the ingredients of Climate. -Methods of Heat Energy Transferring are Convection‚ Conduction‚ Radiation. Conduction involves heat transfer by physical contact between objects. Convection is the process of heat transmission by the actual motion of the heated body. Radiation is the process of heat (energy) transfer by electromagnetic waves‚ without using
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relation to an Action Potential – define the terms threshold‚ hyperpolarization‚ depolarization‚ repolarization and all-or-none-phenomenon. 6. Draw and label the structural components of the the NMJ and explain the events that happen when a nerve impulse reaches the NMJ. 7. What is meant by excitation-contraction coupling? 8. What are the parts of the skeletal muscle triad and what are their functions? 9. Explain the cross bridge cycle‚ and why a filaments do not slide back to their original
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Practice Exam #4 – Chapters 12‚ 13‚ 14 & 15 1) What would normally be found within the central canal of the spinal cord? a) Blood b) Myelin c) Cerebrospinal fluid d) Air e) Gray matter 2) The filum terminale is a) The roots of spinal nerves hanging inferiorly from the end of the spinal cord in the vertebral column b) An indentation on the dorsal side of the spinal cored c) The tapered end of the spinal cord d) An extension of the pia mater that anchors the spinal cord to the coccyx
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