Unit6groudbackknowledge.ppt

Electricity7B U6 背景知识课背景知识课 televisioncomputerfridgewashing machinerice cookerkettlelight/lampmicrowaveair conditionerwatch programmesget information from the Internet keep food cold and freshwash clothescook riceboil watergive us light heat foodkeep us cool in summer and warm in wintertelevisioncomputerfridgewashing machinerice cookerkettlelight/lampmicrowaveair conditioner Electricity gives us______________.power/ energyThere￿are￿different￿ways￿of￿￿producing￿electricity._____________can produce electricity.Electricity is very _____________________, it can make our lives more _______________(easier).We can use electricity to watch programmes . get information from the Internet. cook rice.keep food cold and fresh.wash clothes.boil water.get light heat food.keep us cool in summer and warm in winter.important/ useful/ valuableconvenient……pipes wiresWater travels through the pipes.Electricity ________ _________ the thin wiresflows throughIn a way, electricity is like _________. 某种程度上，某种程度上，waterthin wirescablespower stationWires link to cables under the street. Cables _____ ________ ____ the power station. are connected tobattery---batteries___________ are inside batteries.___________produce electricity.ChemicalsBatteriesElectricity is around us, it’s important, but it is also dangerous, so we must use it safely!Electricity safety tipsswitch the electricity off, not use itmustn’t touch; with wet handstell kids; stay away fromNever put our hands in; the washing machine is on◆Remember to switch the electricity off when we don’t use it. ◆ Stay away from electricity.◆ We mustn’t touch electricity with our wet hands. ◆ Never put hands in when the washing machine is on. ◆Turn off the electricity before changing the bulb. …… Electricity safety tips(rules) Let’s talk•Benny: Daisy, Do you know about electricity?•Daisy: Yes, I know. Electricity gives us …, it flows through wires, … are connected to …，，in a way, electricity is like….•Benny: Electricity is very …in our daily life?•Daisy: I agree! We can use it to…•Benny: but it is also dangerous, we must use it safely.•Daisy: Yes, we must(mustn’t)…May I get a packet of sweets?May I get a packet of electricity?We’ll see the answers next class.。