Lecture 5 Flashcards
Amount of work that a physical system is capable to perform.
Energy
It is the rate of doing work.
Rate at which energy is transferred or converted.
Power
form of energy associated with the position of the force field. Example: energy of a water reservoir at a certain height.
Potential Energy
form of mechanical energy that has something to do with the mass in motion. Example: wind harnessed through wind rotors.
Kinetic Energy
energy associated with random molecular motions within any medium and is usually related to the increase or decrease in the temperature of a substance. Example: Steam production for power generation
Heat (thermal) energy
energy stored in certain chemicals or materials that can be released by chemical reaction. Example: Combustion of fuel such as gasoline and diesel, Energy produced in batteries.
Chemical Energy
this energy is closely related to electrical energy. When a magnetic field is created, a force to propel devices like motors, solenoid valves, and doorbells create work.
Magnetic Energy
the form of energy generated by friction or by a chemical change, having magnetic chemical and radiant effects.
Electrical Energy
a part of the energy of an atomic nucleus, which can be released by fusion or fission or radioactive decay.
Nuclear Energy
the form of energy associated with the vibration or disturbance of matter.
Sound Energy
Enumerate Sources of Energy
Fuel Oil – Gasoline, Diesel, Kerosene, etc.
Coal
Solar – Solar Thermal and Photovoltaic
Biomass – Direct Combustion, Gasification, Pyrolysis, and Biofuel
Wind – Windmill, Windpump, Wind Turbine
Hydro
Geothermal
Wave and Tidal
Ocean Thermal
Extracted or captured directly from the environment.
Primary Energy Source
The transformed primary energy.
Secondary Energy Source
These are the common and widely used sources of energy. eg. Fossil fuel, hydroelectricity, thermal power (from coal, mineral oil, natural gas), nuclear, etc. They are expensive and require established technologies to produce energy around the clock.
Conventional Energy Source
Are the new sources of energy, hence they are still not in common use such as solar, tidal, wind, biogas, and ocean thermal. They are also known as renewable energy sources and have a nominal contribution to national power.
Non-conventional energy source
have a much smaller environmental footprint but they are still expensive and are often limited to producing energy only under certain circumstances. They are location-specific.
Non-conventional energy sources
have limited supply because eventually the nuclear elements and fossil fuels will be used up. In addition, burning fossil fuels release a significant amount of greenhouse gases and contribute to acid rain.
Conventional energy source
Is a natural resource that cannot be reproduced, grown, generated, or used on a scale which can sustain its consumption rate. Once depleted there will be no more available for future use. It includes coal, petroleum, natural gas, and nuclear.
Non-renewable energy source
Is the energy that comes from natural resources such as sunlight, wind, rain, tides, waves and geothermal heat. They are considered renewable because they are naturally replenished at a constant rate. These includes: hydroelectric, solar energy, biomass, wind, geothermal and ocean.
Renewable Energy Source
What are the classifications of agricultural operations?
Tractive Work
Stationary Work
Land Preparation, Seed Bed Preparation, Cultivation, Harvesting, Transporting/Hauling
Tractive Work
Threshing, Water pumping/Irrigating, Milling, Sorting
Stationary work
it can be visualized as a pull or push that tends to move an object.
Force
In tillage tools, this force usually referred to as what??. Units: Newton, kilogram of force (kgf), pound of force (lbf).
Draft
