and that a generator can generator be increased; produces a understand voltage across that a a coil of wire generator by spinning a uses more magnet near it primary fuel per second when it supplies a bigger current understand that electricity is convenient because it is easily transmitted over long distances and has many uses understand that in many power stations a primary energy source heats water, producing steam which drives a turbine coupled to an electrical generator; label a block diagram of the basic components of hydroelectric, thermal and nuclear power stations; understand that some renewable energy sources drive the turbine directly recall that understand explain why nuclear power that contamination stations radioactive by a produce emits radioactive radioactive ionising material is waste and radiation; and more that this emits explain the dangerous ionising difference than a short radiation; and between period of describe contamination irradiation some of the and hazards of irradiation ionising radiation recall that explain how the distribution electricity is of electricity through the distributed National Grid at high through the voltages reduces energy National Grid losses and that the mains supply voltage to our homes is 230 volts discuss discuss qualitatively and methods of quantitatively the reducing effectiveness of methods energy use at of reducing energy home and at demand in a national work context describe understand understand advantages that to how and ensure a different disadvantages security of factors of different electricity affect the energy supply choice of sources nationally, energy we need a source for a mix of
and that a generator produces a voltage across a coil of wire by spinning a magnet near it generator can be increased; understand that a generator uses more primary fuel per second when it supplies a bigger current understand that electricity is convenient because it is easily transmitted over long distances and has many uses understand that in many power stations a primary energy source heats water, producing steam which drives a turbine coupled to an electrical generator; label a block diagram of the basic components of hydroelectric, thermal and nuclear power stations; understand that some renewable energy sources drive the turbine directly recall that nuclear power stations produce radioactive waste and that this emits ionising radiation; and describe some of the hazards of ionising radiation understand that radioactive emits ionising radiation; and explain the difference between contamination and irradiation explain why contamination by a radioactive material is more dangerous than a short period of irradiation recall that electricity is distributed through the National Grid and that the mains supply voltage to our homes is 230 volts explain how the distribution of electricity through the National Grid at high voltages reduces energy losses discuss methods of reducing energy use at home and at work discuss qualitatively and quantitatively the effectiveness of methods of reducing energy demand in a national context describe advantages and disadvantages of different energy sources understand how different factors affect the choice of energy source for a understand that to ensure a security of electricity supply nationally, we need a mix of