CH E243 Chapter Notes - Chapter 2: Electric Dipole Moment, Energy Economics, Generalized Forces
16 Nov 2016
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Energy can exist as thermal, mechanical, kinetic, potential, electric, magnetic, chemical, and nuclear. Their sum constitutes the total energy e of the system. The total energy of a system on a unit mass basis is denoted by e: e = e/m [kj/kg] Thermodynamics provides no info about the absolute value of the total energy; it only deals with the change of the total energy. Forms of energy a system possesses as a whole wrt some outside reference frame, such as kinetic and potential energies. The energy a system possesses as a result of its motion relative to some reference frame. Kinetic energy ke ke = mv2 [kj] or on a unit mass basis ke = v2/2 [kj/kg] The energy a system possesses as a result of its elevation in a gravitational field is called potential energy pe pe = mgz [kj] or on a unit mass basis pe = gz [kj/kg]
