Electricity Transmission And Distribution
Gbogbo ọrọ náà
The cables slung between pylons across open country are thinner than most people expect, and they are carrying the output of an entire power station. They manage it because the potential difference across them is enormous and the current in them is small, and that trade is the single decision on which the whole national supply rests. Get it wrong and a useful fraction of everything a station produces would be wasted warming up the countryside before it reached a single house.
This lesson follows the energy along that route, from the station to the socket, and asks you to be able to name every part of it in order. You will meet the two kinds of transformer that sit at the ends of the transmission line, one raising the voltage for the journey and one lowering it again so that what arrives in a street is safe to bring indoors. Then you will do the arithmetic that shows exactly how much is saved by sending the energy at hundreds of thousands of volts, using two equations you already have on the sheet at the back of your paper.
Ebumnobi
- Electricity is distributed from power stations to consumers along transmission cables with transformers at both ends. Students should be able to identify and label the essential parts of an electric power transmission and distribution system.
- For a given power rating, a high distribution voltage reduces the current flowing, therefore reducing energy losses due to heating and making the system more efficient.
- Step-up and step-down transformers are used to increase the voltage before the distribution lines and reduce it at the end to produce a safer voltage for local consumers.
Maapụ uche
E seela isiokwu a ka ị hụ otu echiche si ejikọta.
Mepee maapụ uche na ngwa
Akwụkwọ Ọmụmụ
Ndetu Nkuzi Zuru Ezu di na Ngwa Green Bridge
Nweta ngwa Green Bridge CBT na ekwenti gi ma o bu kompiuta maka ulo akwukwo IGCSE zuru oke: akwukwo ule ndi gara aga, usoro nyocha, eserese uche, kaadi omumu na nkuzi olu.
Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Electricity Transmission And Distribution. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- Which transformer is placed between a power station and the transmission cables, and what is the effect on the current in those cables? A. A step-up transformer, which increases the current B. A step-up transformer, which decreases the current C. A step-down transformer, which increases the current D. A step-down transformer, which decreases the current Answer: B
- A fixed amount of electrical power is transmitted along an unchanged line. The transmission voltage is doubled. What happens to the power wasted heating the cables? A. It doubles B. It halves C. It falls to one quarter D. It is unchanged Answer: C
- A transmission line carries a current of 50 A and its cables have a total resistance of 4.0 ohms. What is the power wasted heating the cables? A. 200 W B. 2.0 kW C. 10 kW D. 200 kW Answer: C
- Why is the voltage reduced by a transformer before the supply reaches houses in a street? A. To increase the amount of energy delivered each second B. To produce a voltage that is safe for local consumers C. To reduce the resistance of the transmission cables D. To change the alternating supply into a direct one Answer: B
- Which list gives the essential parts of a transmission and distribution system in the order that energy passes through them? A. Power station, step-down transformer, transmission cables, step-up transformer, consumers B. Power station, step-up transformer, transmission cables, step-down transformer, consumers C. Power station, transmission cables, step-up transformer, step-down transformer, consumers D. Step-up transformer, power station, transmission cables, consumers, step-down transformer Answer: B
Rue ajuju ndi a n'ime ngwa ahu
Rue ajuju ndi a n'ime ngwa ahu
Akwụkwọ A Na-atụ Aro
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Electricity Transmission And Distribution? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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