Flashcards
OCR Gateway P2d
Flashcards do conjunto (5)
- 1P2d - Fuels for Power.
- 2Important equationsPower = Voltage x Current
Energy Supplied = Power x Time
Cost of Electricity used = Energy used x cost per kWh - 3Fuels for power stationsThe common fuels used in power stations include:
fossil fuels (coal, oil and natural gas)
nuclear fuels (uranium and, sometimes, plutonium)
renewable biomass (wood, straw and manure).
Each type of fuels has advantages and disadvantages. - 4The National Grid and transformersA transformer is an electrical device that changes the voltage of an AC supply. A transformer changes a high-voltage supply into a low-voltage one, and vice versa.
A transformer that increases the voltage is called a step-up transformer.
A transformer that decreases the voltage is called a step-down transformer. - 5The National GridWhen a current flows through a wire, some energy is lost as heat. The higher the current, the more heat is lost. To reduce these losses, the National Grid transmits electricity at a low current. This requires a high voltage.
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- FlashCards sobre OCR Gateway P2d, criado por Zaaaara em 24-05-2014.
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