Compare the series circuit and the parallel circuit.
|
Series circuit |
Parallel (across) circuit |
Current |
|
|
Voltage |
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|
Total resistance |
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|
B
.
Comment on these electrical circuit schemes.
A
Why are the readings of the ammeters different?
Which ammeter correctly measures the current flowing through r1? r2?
Which ammeter correctly measures the total current?
D
C
What is the reading of a voltmeter
for this series circuit?
Why does the voltmeter show the different quantity of Volts?
E
F
If the Voltmeter reads 20 V and the ammeter reads 1a solve for the equivalent resistance Req.
Are these statements Are these statements
about series circuits true or false? about electrical circuits true or false?
UNIT 5 ELECTRICITY GENERATION
source – источник step – up station – повышающая подстанция
deliver – доставлять step – down station – понижающая подстанция
consumer - потребитель fission - расщепление
distribution – распределение storage - хранение
Read the text.
Electricity generation is the process of generating electric power from other sources of primary energy. The fundamental principles of electricity generation were discovered during the 1820s and early 1830s by the British scientist Michael Faraday. His basic method is still used today: electricity is generated by the movement of a loop of wire, or disc of copper between the poles of a magnet. For electric utilities, it is the first process in the delivery of electricity to consumers. The other processes, electricity transmission, distribution, and electrical power storage and recovery using pumped-storage methods are normally carried out by the electric power industry. Electricity is most often generated at a power station by electromechanical generators, primarily driven by heat engines fueled by chemical combustion or nuclear fission but also by other means such as the kinetic energy of flowing water and wind. Other energy sources include solar photovoltaic and geothermal power.
Central power stations became economically practical with the development of alternating current power transmission, using power transformers to transmit power at high voltage and with low loss. Electricity has been generated at central stations since 1882. The first power plants were run on water power or coal, and today we rely mainly on coal, nuclear, natural gas, hydroelectric, wind generators, and petroleum, with a small amount from solar energy, tidal power, and geothermal sources. The use of power-lines and power-poles have been significantly important in the distribution of electricity.
