Energy flow

internal energy, Q is heat transfer, and W is work done by the system. I still find this less convenient that U = Q + W where W is work done on the system (positive) as opposed to work done by the system. The end result is the same, I just find keeping track of the sign more difficult. Notice how the First Law is all capitals. If we normalize each unit by dividing by mass, the First Law is written as u = q − w. To differentiate between the U and u terms, u is called specific internal energy, q is called

Focus On Concepts Section 15.3  The First Law of Thermodynamics 1. The first law of thermodynamics states that the change U in the internal energy of a system is given by U = Q - W, where Q is the heat and W is the work. Both Q and W can be positive or negative numbers. Q is a positive number if ________, and W is a positive number if ________.  (a) the system loses heat; work is done by the system  (b) the system loses heat; work is done on the system  (c) the system gains heat; work is done by

Energy has been an important part of human evolution. Ever since human began development, energy was a major factor. We need energy for everything we do. Heat is one of many types of energy, and it is a very important type of energy. We use heat to warm our shelter, drive cars. Heat transfer is one of the most obvious processes in the nature. It occurs at all the places such as machine, biological creatures, etc… In engineering this heat transfer is a key part of understanding heat energy. The study

by one degree centigrade. In order to determine the heat that flows in a physical process, it is important to determine the calorimetric constant for the dewar flask calorimeter. Determination of Calorimetric Constant Whenever a body undergoes a change in its chemical or physical nature, change in energy occurs. This change is commonly observed as heat flows from a hotter region to a colder region. To measure this energy, a calorimeter is required. Although some reactions require specific

this the best discovery. Electricity is a fundamental form of energy observable in positive and negative forms that occurs naturally or is produced and that is expressed in terms of the movement and interaction of electrons (Merriam-Webster). The discovery of electricity dates back to about 600 BC, during the times of Ancient Greeks. Static electricity was first discovered when the people during that era rubbed fur on amber to create energy. There are common misunderstandings of when electricity was

cold object becomes warmer. This energy in transit is a result of temperature difference and is called “heat”. The fact that heat always flows from a higher to lower temperature leads to the concept that temperature is the driving force for the transfer of energy as heat. Heat transfer deals with the mechanisms responsible for transferring heat from one place to another when a temperature difference exists between two objects. Heat is measured in kilojoules(kJ) of energy and heat transferred is usually

AlmaOlguin Period:5 Science Fair Research In our daily life, we constantly have interactions of chemical reactions, such as endothermic and exothermic reactions. In general all chemical reactions are important to our society to achieve certain activities. Some examples are smelting iron,making class, burning fuels,brewing beer, making wine and cheese, and etc. Most importantly I will be researching what are exothermic and endothermic reactions and how they can affect our daily life. Chemical

wastes a lot of heat. Between half and two-thirds of the fuel we burn to create energy is dissipated as heat into the atmosphere.

turbine by definition is an engine in the centre of a power plant producing electric current [1]. It is also a rotary engine extracting energy from flow of combustion gas. Gas turbine is responsible for the conversion of natural gas or any other liquid fuels into mechanical energy. This energy can therefore be used to drive the generator to produce electrical energy [1-3]. Gas turbine is made up of components as shown in Figure 1 below. Figure 1: Gas turbine showing arrangements

and powerful instant water heater that can be used both for heating water and radiant heating in your home. Very compact unit Energy and Money saving It provides instant and unlimited supply of hot water Less weight and can be installed easily Can be used both for hot water as well as radiant heat usages Can be used comfortably for houses with 1 or 2 bathrooms Has a flow rate of .75 to 5. 8 gallons per minute Can operated at a Temperature Range of : 99+F to 182+F Takagi TK