925461
| Questão | Responda |
| P2d - Fuels for Power | . |
| Important equations | Power = Voltage x Current Energy Supplied = Power x Time Cost of Electricity used = Energy used x cost per kWh |
| Fuels for power stations | The 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. |
| The National Grid and transformers | A 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. |
| The National Grid | When 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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