Presentation on theme: "Chapter 11 Magnetism Electrical Generation Electrical Transmission Environmental Impacts of High Voltage Lines Standard Power Generation Cogeneration and."— Presentation transcript:
Chapter 11 Magnetism Electrical Generation Electrical Transmission Environmental Impacts of High Voltage Lines Standard Power Generation Cogeneration and Combined Cycle Plants
Parts of an Electric Motor Simple Electric Motor Outside: Field magnet (permanent Magnet) Inside: Rotating Electromagnet Reverses its field every half rotation http://www.howstuffworks.com/motor2.htm
Detail of Electromagnet in Motor Electromagnet is connected to A battery or other power source Armature (green) allows the current Direction to switch every 180 Degree rotation, thus switching The North and south poles of The Electromagnet
Two Types of Current Direct Current (DC): constant intensity and sign Alternating Current(AC): varying intensity and sign Some devices generate direct current, some Generate alternating current.
Cross Section of Gas Turbine Gas turns blades on left: Right side connected to generator
High Voltage Transmission Lines Typical Voltage: 345,000 Volts Why are the voltages So high?
Transformer: Changes Voltage and Current (not Power) Two coils with alterating Current. First coil induces A current in the second coil. Difference in voltage Proportional to difference in Number of windings of Wire. V in * I in = V out * I out
Transformer on Power Pole Why is the voltage stepped Down at the last minute, just Before power is sent into The house?