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Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering. Weight is gravitational-force act on a body and its magnitude is determined from Newton’s second law Since then scientists and engineers have been making a constant and continuous effort of making it as user-friendly as possible. Obviously, the number of photons strike on the metal surface increases hence more emitted electrons will be produced, but the kinetic energy of each electron will be unchanged as the frequency of incident light is fixed, in that case. The frequency of incident light below which no photoemission on a metal surface gets initiated is called. But below this minimum frequency, there will be no kinetic energy in the electrons. Chemical thermodynamics is the portion of thermodynamics that pertains to chemical reactions. AP® is a registered trademark of the College Board, which has not reviewed this resource. In the Quasi-equilibrium (quasi-static) process the deviation from the thermodynamic equilibrium state is extremely small. This phenomenon is classically termed as. The word thermodynamics is derived from the Greek word theme (means heat) and dynamics (means force). Physical quantity is known by its dimensions and if the magnitude is given to this dimension then it is termed as a unit. or to provide electrical energy through a galvanic cell like dry cell. Now when the light strikes on a metal surface electrons on the surface of the metal get energy from the light and get emitted from the surface. Energy is the reason for the matter to exist in different phases. When gravitational acceleration changes then the weight of the body also changes. In contrast to the extensive property, an intensive property is not mass dependent and non additive in nature and does not depend upon on the total size of the system. Pressure: Pressure is defined as a normal force exerted by a fluid per unit area in case of liquid or gas. Search for courses, … There are relations among the properties of a system but the state can be specified by providing the value of a subset of the properties. Material can exist in a single phase like liquid or can also exist in more than one phase in equilibrium with each other. Example of System can be to analyze the refrigeration cycle in cold storage plant or to analyze the Rankine cycle in a power plant. Our mission is to provide a free, world-class education to anyone, anywhere. Thermodynamic processes are the conversion of one state to another state. Since then scientists and engineers have been making a constant and continuous effort of making it as user-friendly as possible. In solid pressure is equivalent to normal stress. In mechanics, equilibrium is said to have reached when we equalises the opposing forces. no emission of an electron. SI system of unit representation is more logical and commonly used by professionals. Under this situation, the system is in complete stability with the restraints offered by the surroundings. SI Unit of pressure and stress is Pascal (N/ m2). The energy in transition alone is called heat. Full disclaimer here. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. Intensive properties like pressure and temperature to be accurately measured in order to assign the state. Thermodynamics is defined as the branch of science that deals with the relationship between heat and other forms of energy, such as work. Work If you're seeing this message, it means we're having trouble loading external resources on our website. Now, If we graphically represent the above points we will get the graph below, A system is defined as a definite mass of pure substance bounded by a closed or flexible surface; similarly, the composition of matter inside the system can be fixed or variable depending upon the cycle. E= EMF of the cell. Matter is known for its mass, volume and space and irrespective of its structure and nature it has certain characteristics like consistency and reliability. Theory of matter is helpful in understanding the concept of energy. dw = pdv [Btu / lbm | KJ/kg ] …….. (2) If the frequency of light is higher than that above-mentioned minimum frequency, the extra energy of photon will be converted to kinetic energy of the emitted electron. A system is something which we want to study and interested in, thus the first step is to fix precisely the objective of system study. Engineers and scientists around the globe are performing their calculations mainly on two types of units called the English system and Metric system (SI). To log in and use all the features of Khan Academy, please enable JavaScript in your browser. But for non homogenous substance, more than two properties are required to describe the state. Enter your email below to receive FREE informative articles on Electrical & Electronics Engineering, Graphical Representation of Work Function, SCADA System: What is it?

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